ohm’s law and power - avarcohm’s law •relationship between voltage, current and resistance can...
TRANSCRIPT
![Page 1: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/1.jpg)
Ohm’s Law and Power Al Penney
VO1NO
Chapter 3
![Page 2: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/2.jpg)
Voltage and Current
As Voltage is increased, Current also increases.
Voltage in Volts
Current
In Amps
Al Penney
VO1NO
![Page 3: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/3.jpg)
Ohm’s Law
• Relationship between Voltage, Current and Resistance can be expressed mathematically as:
E = I x R Where
E is measured in Volts;
I is measured in Amps; and
R is measured in Ohms. Al Penney
VO1NO
![Page 4: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/4.jpg)
Ohm’s Law
The equation can be re-written to determine any of the 3 variables if the other two are known:
I = E / R And
R = E / I
Al Penney
VO1NO
![Page 5: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/5.jpg)
Al Penney
VO1NO
![Page 6: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/6.jpg)
Ohms Law Triangle
Remember the Units:
- E is measured in VOLTS
- I is measured in AMPS
- R is measured in OHMS
Al Penney
VO1NO
![Page 7: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/7.jpg)
Ohms Law Triangle (Okay – Circle!)
Al Penney
VO1NO
![Page 8: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/8.jpg)
Ohms Law Problem #1
12 Volts 96 Ohms
What is the current?
Al Penney
VO1NO
![Page 9: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/9.jpg)
Ohms Law Problem #1
12 Volts 96 Ohms
What is the current?
Consult the Ohms Law Triangle:
Al Penney
VO1NO
![Page 10: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/10.jpg)
Ohms Law Problem #1
12 Volts 96 Ohms
What is the current?
Consult the Ohms Law Triangle: I = E / R
Al Penney
VO1NO
![Page 11: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/11.jpg)
Ohms Law Problem #1
12 Volts 96 Ohms
What is the current?
I = E / R
I = 12 Volts / 96 Ohms
I =
Al Penney
VO1NO
![Page 12: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/12.jpg)
Ohms Law Problem #1
12 Volts 96 Ohms
What is the current?
I = E / R
I = 12 Volts / 96 Ohms
I = 0.125 Amps
Al Penney
VO1NO
![Page 13: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/13.jpg)
Ohms Law Problem #2
1.5 Amps
15 Ohms
What is the voltage?
Al Penney
VO1NO
![Page 14: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/14.jpg)
Ohms Law Problem #2
1.5 Amps
15 Ohms
What is the voltage?
Consult the Ohms Law Triangle:
Al Penney
VO1NO
![Page 15: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/15.jpg)
Ohms Law Problem #2
1.5 Amps
15 Ohms
What is the voltage?
Consult the Ohms Law Triangle: E = I x R
Al Penney
VO1NO
![Page 16: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/16.jpg)
Ohms Law Problem #2
1.5 Amps
15 Ohms
What is the voltage?
E = I x R
= 1.5 Amps x 15 Ohms
Al Penney
VO1NO
![Page 17: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/17.jpg)
Ohms Law Problem #2
1.5 Amps
15 Ohms
What is the voltage?
E = I x R
= 1.5 Amps x 15 Ohms
= 22.5 Volts
Al Penney
VO1NO
![Page 18: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/18.jpg)
Ohms Law Problem #3
150 millivolts
What is the resistance?
30 milliamps
Al Penney
VO1NO
![Page 19: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/19.jpg)
Ohms Law Problem #3 What is the resistance?
30 milliamps
Consult the Ohms Law Triangle:
150 millivolts
Al Penney
VO1NO
![Page 20: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/20.jpg)
Ohms Law Problem #3 What is the resistance?
30 milliamps
Consult the Ohms Law Triangle: R = E / I
150 millivolts
Al Penney
VO1NO
![Page 21: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/21.jpg)
Ohms Law Problem #3 What is the resistance?
30 milliamps
R = E / I
= 150 millivolts / 30 milliamps
150 millivolts
Al Penney
VO1NO
![Page 22: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/22.jpg)
Ohms Law Problem #3
• REMEMBER the UNITS!
– 150 millivolts = 150 / 1000 volts = 0.15 volts
– 30 milliamps = 30 / 1000 amps = 0.03 amps
Al Penney
VO1NO
![Page 23: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/23.jpg)
Ohms Law Problem #3 What is the resistance?
30 milliamps
R = E / I
= 150 millivolts / 30 milliamps
= 0.15 Volts / 0.03 Amps
150 millivolts
Al Penney
VO1NO
![Page 24: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/24.jpg)
Ohms Law Problem #3 What is the resistance?
30 milliamps
R = E / I
= 150 millivolts / 30 milliamps
= 0.15 Volts / 0.03 Amps
= 5 Ohms
150 millivolts
Al Penney
VO1NO
![Page 25: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/25.jpg)
Resistors in Series
• When resistors are in SERIES, the total resistance is the SUM of the individual resistances.
RTotal = R1 + R2 + R3 + ….. + RN
Al Penney
VO1NO
![Page 26: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/26.jpg)
Resistors in Series 5 Ω 15 Ω
25 Ω
Al Penney
VO1NO
![Page 27: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/27.jpg)
Resistors in Series 5 Ω 15 Ω
25 Ω RTotal = R1 + R2 + R3
Al Penney
VO1NO
![Page 28: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/28.jpg)
Resistors in Series 5 Ω 15 Ω
25 Ω RTotal = R1 + R2 + R3
RTotal = 5 Ω + 15 Ω + 25 Ω
Al Penney
VO1NO
![Page 29: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/29.jpg)
Resistors in Series 5 Ω 15 Ω
25 Ω RTotal = R1 + R2 + R3
RTotal = 5 Ω + 15 Ω + 25 Ω
RTotal = 45 Ω
Al Penney
VO1NO
![Page 30: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/30.jpg)
Resistors in Parallel
• When resistors are in Parallel, the total resistance is given by the following equation:
1/RTotal = 1/R1 + 1/R2 + 1/R3 + ….. + 1/RN
Al Penney
VO1NO
![Page 31: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/31.jpg)
Resistors in Parallel
25 Ω 75 Ω 50 Ω 25 Ω
A
B
Al Penney
VO1NO
![Page 32: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/32.jpg)
Resistors in Parallel
25 Ω 75 Ω 50 Ω 25 Ω
A
B
1/RTotal = 1/R1 + 1/R2 + 1/R3 + 1/R4
Al Penney
VO1NO
![Page 33: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/33.jpg)
Resistors in Parallel
25 Ω 75 Ω 50 Ω 25 Ω
A
B
1/RTotal = 1/R1 + 1/R2 + 1/R3 + 1/R4
1/RTotal = 1/25 + 1/75 + 1/50 + 1/25
Al Penney
VO1NO
![Page 34: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/34.jpg)
Resistors in Parallel
25 Ω 75 Ω 50 Ω 25 Ω
A
B
1/RTotal = 1/R1 + 1/R2 + 1/R3 + 1/R4
1/RTotal = 1/25 + 1/75 + 1/50 + 1/25 = 6/150 + 2/150 + 3/150 + 6/150
Al Penney
VO1NO
![Page 35: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/35.jpg)
Resistors in Parallel
25 Ω 75 Ω 50 Ω 25 Ω
A
B
1/RTotal = 1/R1 + 1/R2 + 1/R3 + 1/R4
1/RTotal = 1/25 + 1/75 + 1/50 + 1/25 = 6/150 + 2/150 + 3/150 + 6/150
1/RTotal = 17/150 Ω
Al Penney
VO1NO
![Page 36: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/36.jpg)
Resistors in Parallel
25 Ω 75 Ω 50 Ω 25 Ω
A
B
1/RTotal = 1/R1 + 1/R2 + 1/R3 + 1/R4
1/RTotal = 1/25 + 1/75 + 1/50 + 1/25 = 6/150 + 2/150 + 3/150 + 6/150
1/RTotal = 17/150 Ω
RTotal = 150/17 Ω = 8.82 Ω
Al Penney
VO1NO
![Page 37: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/37.jpg)
Al Penney
VO1NO
![Page 38: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/38.jpg)
Current in a Series Circuit
• The current through each resistor in a Series Circuit is identical.
ITotal = IR1 = IR2 = IR3 Al Penney
VO1NO
![Page 39: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/39.jpg)
Voltage in Series Circuits
• The sum of all the voltages across each resistor in a Series Circuit will equal the source voltage.
20 Volts
Esource = ER1 + ER2 + ER3
5 Ω
15 Ω
20 Ω
Al Penney
VO1NO
![Page 40: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/40.jpg)
To Calculate Voltage Drop…
20 Volts
5 Ω
15 Ω
20 Ω
Al Penney
VO1NO
![Page 41: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/41.jpg)
1. Determine Total Resistance
20 Volts
5 Ω
15 Ω
20 Ω
RTotal = R1 + R2 + R3
RTotal =
Al Penney
VO1NO
![Page 42: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/42.jpg)
1. Determine Total Resistance
20 Volts
5 Ω
15 Ω
20 Ω
RTotal = R1 + R2 + R3
RTotal = 5 Ω + 15 Ω + 20 Ω
RTotal = 40 Ω
Al Penney
VO1NO
![Page 43: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/43.jpg)
2. Determine Current
20 Volts
5 Ω
15 Ω
20 Ω
RTotal = R1 + R2 + R3
RTotal = 5 Ω + 15 Ω + 20 Ω
RTotal = 40 Ω
I = E / R
I =
Al Penney
VO1NO
![Page 44: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/44.jpg)
2. Determine Current
20 Volts
5 Ω
15 Ω
20 Ω
RTotal = R1 + R2 + R3
RTotal = 5 Ω + 15 Ω + 20 Ω
RTotal = 40 Ω
I = E / R
I = 20 Volts / 40 Ohms
I = 0.5 Amps
Al Penney
VO1NO
![Page 45: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/45.jpg)
3. Determine Voltage Drops
20 Volts
5 Ω
15 Ω
20 Ω
RTotal = R1 + R2 + R3
RTotal = 5 Ω + 15 Ω + 20 Ω
RTotal = 40 Ω
I = E / R
I = 20 Volts / 40 Ohms
I = 0.5 Amps
ER1 = I x R1
ER1 =
ER2 = I x R2
ER2 =
ER3 = I x R3
ER3 =
Al Penney
VO1NO
![Page 46: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/46.jpg)
3. Determine Voltage Drops
20 Volts
5 Ω
15 Ω
20 Ω
RTotal = R1 + R2 + R3
RTotal = 5 Ω + 15 Ω + 20 Ω
RTotal = 40 Ω
I = E / R
I = 20 Volts / 40 Ohms
I = 0.5 Amps
ER1 = I x R1
ER1 = 0.5 Amps x 5 Ω
ER1 = 2.5 Volts
ER2 = I x R2
ER2 = 0.5 Amps x 15 Ω
ER2 = 7.5 Volts
ER3 = I x R3
ER3 = 0.5 Amps x 20 Ω
ER3 = 10 Volts
Al Penney
VO1NO
![Page 47: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/47.jpg)
4. Check Your Results!
20 Volts
5 Ω
15 Ω
20 Ω
RTotal = R1 + R2 + R3
RTotal = 5 Ω + 15 Ω + 20 Ω
RTotal = 40 Ω
I = E / R
I = 20 Volts / 40 Ohms
I = 0.5 Amps
ER1 = I x R1
ER1 = 0.5 Amps x 5 Ω
ER1 = 2.5 Volts
ER2 = I x R2
ER2 = 0.5 Amps x 15 Ω
ER2 = 7.5 Volts
ER3 = I x R3
ER3 = 0.5 Amps x 20 Ω
ER3 = 10 Volts
Esource = ER1 + ER2 + ER3
Esource = 2.5V + 7.5V + 10V = 20V
Al Penney
VO1NO
![Page 48: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/48.jpg)
Voltage in Parallel Circuits
• The voltage applied to each resistor in a Parallel Circuit is the same as the source voltage.
Esource = ER1 = ER2 = ER3 = ER4
Al Penney
VO1NO
![Page 49: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/49.jpg)
Current in a Parallel Circuit
• The total current in a Parallel Circuit is divided among the resistors.
• The sum of the currents through each resistor equals the total current.
ITotal = IR1 + IR2 + IR3 Al Penney
VO1NO
![Page 50: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/50.jpg)
To Calculate Currents…
500 Ω 500 Ω 1KΩ 100 Volts
Al Penney
VO1NO
![Page 51: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/51.jpg)
Determine Equivalent Resistance
500 Ω 500 Ω 1KΩ
1/RTotal =
100 Volts
Al Penney
VO1NO
![Page 52: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/52.jpg)
Determine Equivalent Resistance
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
100 Volts
Al Penney
VO1NO
![Page 53: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/53.jpg)
Determine Equivalent Resistance
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
100 Volts
Al Penney
VO1NO
![Page 54: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/54.jpg)
Determine Equivalent Resistance
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
RTotal = 1000/5 = 200 Ω
100 Volts
Al Penney
VO1NO
![Page 55: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/55.jpg)
Determine Overall Current
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
RTotal = 1000/5 = 200 Ω
100 Volts I =
Al Penney
VO1NO
![Page 56: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/56.jpg)
Determine Overall Current
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
RTotal = 1000/5 = 200 Ω
100 Volts I = E / R
Al Penney
VO1NO
![Page 57: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/57.jpg)
Determine Overall Current
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
RTotal = 1000/5 = 200 Ω
100 Volts I = E / R
I = 100 V / 200 Ω
I = 0.5 Amps
Al Penney
VO1NO
![Page 58: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/58.jpg)
Determine Individual Currents
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
RTotal = 1000/5 = 200 Ω
100 Volts I = E / R
I = 100 V / 200 Ω
I = 0.5 Amps
IR1 =
IR2 = IR3 =
Al Penney
VO1NO
![Page 59: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/59.jpg)
Determine Individual Currents
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
RTotal = 1000/5 = 200 Ω
100 Volts I = E / R
I = 100 V / 200 Ω
I = 0.5 Amps
IR1 = E / R1
IR2 = E / R2
IR3 = E / R3
Al Penney
VO1NO
![Page 60: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/60.jpg)
Determine Individual Currents
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
RTotal = 1000/5 = 200 Ω
100 Volts I = E / R
I = 100 V / 200 Ω
I = 0.5 Amps
IR1 = E / R1
IR1 = 100 V / 500 Ω
IR1 =
IR2 = E / R2
IR2 = 100 V / 500 Ω
IR2 =
IR3 = E / R3
IR3 = 100 V / 1000 Ω
IR3 =
Al Penney
VO1NO
![Page 61: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/61.jpg)
Determine Individual Currents
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
RTotal = 1000/5 = 200 Ω
100 Volts I = E / R
I = 100 V / 200 Ω
I = 0.5 Amps
IR1 = E / R1
IR1 = 100 V / 500 Ω
IR1 = 0.2 Amps
IR2 = E / R2
IR2 = 100 V / 500 Ω
IR2 = 0.2 Amps
IR3 = E / R3
IR3 = 100 V / 1000 Ω
IR3 = 0.1 Amps
Al Penney
VO1NO
![Page 62: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/62.jpg)
Check your Answer!
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
RTotal = 1000/5 = 200 Ω
100 Volts I = E / R
I = 100 V / 200 Ω
I = 0.5 Amps
IR1 = E / R1
IR1 = 100 V / 500 Ω
IR1 = 0.2 Amps
IR2 = E / R2
IR2 = 100 V / 500 Ω
IR2 = 0.2 Amps
IR3 = E / R3
IR3 = 100 V / 1000 Ω
IR3 = 0.1 Amps
ITotal = Al Penney
VO1NO
![Page 63: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/63.jpg)
Check your Answer!
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
RTotal = 1000/5 = 200 Ω
100 Volts I = E / R
I = 100 V / 200 Ω
I = 0.5 Amps
IR1 = E / R1
IR1 = 100 V / 500 Ω
IR1 = 0.2 Amps
IR2 = E / R2
IR2 = 100 V / 500 Ω
IR2 = 0.2 Amps
IR3 = E / R3
IR3 = 100 V / 1000 Ω
IR3 = 0.1 Amps
ITotal = IR1 + IR2 + IR3 = Al Penney
VO1NO
![Page 64: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/64.jpg)
Check your Answer!
500 Ω 500 Ω 1KΩ
1/RTotal = 1/R1 + 1/R2 + 1/R3
1/RTotal = 1/500 + 1/500 + 1/1K
1/RTotal = 2/1000 + 2/1000 + 1/1000
1/RTotal = 5/1000
RTotal = 1000/5 = 200 Ω
100 Volts I = E / R
I = 100 V / 200 Ω
I = 0.5 Amps
IR1 = E / R1
IR1 = 100 V / 500 Ω
IR1 = 0.2 Amps
IR2 = E / R2
IR2 = 100 V / 500 Ω
IR2 = 0.2 Amps
IR3 = E / R3
IR3 = 100 V / 1000 Ω
IR3 = 0.1 Amps
ITotal = IR1 + IR2 + IR3 = 0.2 + 0.2 + 0.1 = 0.5 Amp Al Penney
VO1NO
![Page 65: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/65.jpg)
Series Parallel Combinations
Al Penney
VO1NO
![Page 66: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/66.jpg)
Series Parallel Combinations
1 KΩ
1 KΩ 1.5 KΩ
100 Volts
Al Penney
VO1NO
![Page 67: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/67.jpg)
Series Parallel Combinations
1 KΩ
1 KΩ 1.5 KΩ
100 Volts
1/R =
Al Penney
VO1NO
![Page 68: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/68.jpg)
Series Parallel Combinations
1 KΩ
1 KΩ 1.5 KΩ
100 Volts
1/R = 1/R2 + 1/R3
Al Penney
VO1NO
![Page 69: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/69.jpg)
Series Parallel Combinations
1 KΩ
1 KΩ 1.5 KΩ
100 Volts
1/R = 1/R1 + 1/R2
1/R = 1/1 K + 1/1.5 K
Al Penney
VO1NO
![Page 70: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/70.jpg)
Series Parallel Combinations
1 KΩ
1 KΩ 1.5 KΩ
100 Volts
1/R = 1/R1 + 1/R2
1/R = 1/1 K + 1/1.5 K
1/R = 3/3 K + 2/3 K
1/R = 5/3 K
Al Penney
VO1NO
![Page 71: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/71.jpg)
Series Parallel Combinations
1 KΩ
1 KΩ 1.5 KΩ
100 Volts
1/R = 1/R1 + 1/R2
1/R = 1/1 K + 1/1.5 K
1/R = 3/3 K + 2/3 K
1/R = 5/3 K
R = 3000/5 = 600 Ω
Al Penney
VO1NO
![Page 72: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/72.jpg)
Series Parallel Combinations
1 KΩ
1 KΩ 1.5 KΩ
100 Volts
1/R = 1/R1 + 1/R2
1/R = 1/1 K + 1/1.5 K
1/R = 3/3 K + 2/3 K
1/R = 5/3 K
R = 3000/5 = 600 Ω
RTotal =
Al Penney
VO1NO
![Page 73: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/73.jpg)
Series Parallel Combinations
1 KΩ
1 KΩ 1.5 KΩ
100 Volts
1/R = 1/R1 + 1/R2
1/R = 1/1 K + 1/1.5 K
1/R = 3/3 K + 2/3 K
1/R = 5/3 K
R = 3000/5 = 600 Ω
RTotal = 1 KΩ + 600 Ω
Al Penney
VO1NO
![Page 74: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/74.jpg)
Series Parallel Combinations
1 KΩ
1 KΩ 1.5 KΩ
100 Volts
1/R = 1/R1 + 1/R2
1/R = 1/1 K + 1/1.5 K
1/R = 3/3 K + 2/3 K
1/R = 5/3 K
R = 3000/5 = 600 Ω
RTotal = 1 KΩ + 600 Ω
RTotal = 1600 Ω
Al Penney
VO1NO
![Page 75: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/75.jpg)
Series Parallel Combinations
1 KΩ
1 KΩ 1.5 KΩ
100 Volts
1/R = 1/R1 + 1/R2
1/R = 1/1 K + 1/1.5 K
1/R = 3/3 K + 2/3 K
1/R = 5/3 K
R = 3000/5 = 600 Ω
RTotal = 1 KΩ + 600 Ω
RTotal = 1600 Ω
RTotal = 1.6 KΩ
Al Penney
VO1NO
![Page 76: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/76.jpg)
Energy and Power
• Energy is the ability to do work.
• Two types: Kinetic and Potential
• A cell has Potential Energy – it stores chemical energy that can be released to do work.
• When electrons move against a resistance, work is done.
• The rate at which work is done is called Power
Al Penney
VO1NO
![Page 77: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/77.jpg)
Power
• Basic unit of Power is the Watt, abbreviated W.
• In electrical systems, we can calculate power if we know any two of
– Voltage;
– Current; or
– Resistance.
P = E x I = E2 / R = I2 x R
Al Penney
VO1NO
![Page 78: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/78.jpg)
Calculating Power #1
12 Volts
50 Ω
P = E x I = E2 / R = I2 x R
Al Penney
VO1NO
![Page 79: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/79.jpg)
Calculating Power #1
12 Volts
50 Ω
P = E x I = E2 / R = I2 x R
P = E2 / R
Al Penney
VO1NO
![Page 80: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/80.jpg)
Calculating Power #1
12 Volts
50 Ω
P = E x I = E2 / R = I2 x R
P = E2 / R
P = 122 / 50
P = 144 / 50
P = 2.88 Watts
Al Penney
VO1NO
![Page 81: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/81.jpg)
Calculating Power #2
12 Volts
I = 0.24 Amp
P = E x I = E2 / R = I2 x R
Al Penney
VO1NO
![Page 82: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/82.jpg)
Calculating Power #2
12 Volts
I = 0.24 Amp
P = E x I = E2 / R = I2 x R
P = E x I
Al Penney
VO1NO
![Page 83: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/83.jpg)
Calculating Power #2
12 Volts
I = 0.24 Amp
P = E x I = E2 / R = I2 x R
P = E x I
P = 12 x 0.24
P = 2.88 Watts
Al Penney
VO1NO
![Page 84: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/84.jpg)
Calculating Power #3
50 Ω
P = E x I = E2 / R = I2 x R
I = 0.24 Amp
Al Penney
VO1NO
![Page 85: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/85.jpg)
Calculating Power #3
50 Ω
P = E x I = E2 / R = I2 x R
P = I2 x R
I = 0.24 Amp
Al Penney
VO1NO
![Page 86: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/86.jpg)
Calculating Power #3
50 Ω
P = E x I = E2 / R = I2 x R
P = I2 x R
P = 0.242 x 50
P = 0.0576 x 50
P = 2.88 Watts
I = 0.24 Amp
Al Penney
VO1NO
![Page 87: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/87.jpg)
Circuit Calculator
Remember the Units – Ohms, Volts, Amps, Watts!! Al Penney
VO1NO
![Page 88: Ohm’s Law and Power - AVARCOhm’s Law •Relationship between Voltage, Current and Resistance can be expressed mathematically as: E = I x R Where E is measured in Volts; I is measured](https://reader030.vdocument.in/reader030/viewer/2022040900/5e6edafd69ac314ac24b1a99/html5/thumbnails/88.jpg)
Questions?
Al Penney
VO1NO