EET 110 - Survey of Electronics
Chapter 14 - Series-parallel circuits
Homework Problems - Ch. 12
Find all unknown values of V, I, R and P
Prob. 7
80V
Homework problems - Ch. 13
#1 - Find all unknown V, I, R, and P for:
Voltage Current Resistance Power
R1
R2
Total
R3
8
10
4
40 v
Problem 2 - values of V, I, R, and P
I2=4A
Voltage Current Resistance Power
R1
R2
Total
R3
20
50 v
4 A
#3 - Find V, I, R, and P
I1=22mA
Voltage Current Resistance Power
R1
R2
Total
4.7 k
22 mA
3.3 k
#4 - find V, I, R, and P10 V
Voltage Current Resistance
R1
R2
Total
10 V
Series-Parallel Circuits
Circuits having components in both Series and Parallel connection have some basic relationships that provide a simple solution.
Kirchhoff’s Voltage Law
For a ‘closed loop’, the sum of voltages is zero
For this circuit, – VT = V1 + V2 + V3
“Around a closed loop, the algebraic sum of all the voltages is zero.”
Kirchhoff’s Current Law “The current entering any point in a circuit
is equal to the current leaving that same point.”
Solving Series-Parallel Circuits
Use a combination of Kirchhoff’s laws, and resistor calculations we can solve the circuit
Example 14-2
Example 14-3
Example 14-4
Assignment
Problems Ch14: 1-4
Exam 1 Review
Chapters 1-14 Electrical Units
– Volts, Amps, Watts, Watt-hours Resistance
– Ohms– Resistor Color Code– Series/Parallel equivalent
Ohms Law Forms
Exam 1 Review
Series Circuits– Current is same– Voltage Divider Rule
Parallel Circuits– Voltage is the same– Current Divider Rule
Exam 1 Review
Series-Parallel Circuits– Back and forth
Kirchoff’s Laws– Current – at a node current in=current out
Sum = 0
– Voltage – around closed loop, voltage rises = voltage drops
Sum = 0
Exam 1 – Review
Schematic symbols/diagrams Bring
– Formula sheet– Calculator– Straight edge– Scratch paper