Lab 1 Breadboard and Measurement Techniques

Tom Rebold

Calculate the current in this circuit using Ohm’s Law

3

6VI

R

VI

Ohm’s Law, Including Power

Reproduced by permission of Tony van Roon, 2002 http://www.uoguelph.ca/~antoon

How Many Watts dissipated by Resistor?

2A

300

P=I2R

Series Circuits One current path, therefore the

current is the same everywhere

Total resistance is the sum of the individual resistances

...21 RRRT

VOLTAGE DIVIDER

I

21

212

22

21

1

RR

RVV

IRV

RR

VI

Calculate RT and the current in this circuit, and v1

4 8

6Vv1

Parallel Circuits More than one current path

Total current is the sum of the individual currents

...21 IIIT

Parallel Circuits (2)

valuesametheifn

R

onlyifRR

RRRRR

RT

(

)2(

...111

1

21

21

321

Calculate RT and the current in each branch of this circuit

6 3 6V

i1 i2

IT

Calculate RT and the current in each branch of this circuit

3

6V 6 6

i1 i2

IT

Lab--The Breadboard

Vin (6 V)

Vss (Ground)

Each row isConnected

Lab--A Simple Circuit

Vin (6 V)

Vss (Ground)

Each row isConnected

Wire the following parallel circuit on the breadboard

6 3 6V

i1 i2

IT

The Parallel circuit from previous

Vin (6 V)

Vss (Ground)

A Series Circuit

Vin (6 V)

Vss (Ground)

Lab--Measure Volts in Parallel

Because the voltmeter is placed in parallel with the circuit element, you do not need to physically alter your circuit in order to measure voltage.

Measure Voltage in Parallel

Vin (6 V)

Vss (Ground)

V

Measure Current in Series

You must physically modify your circuit:1.Create a gap in the segment where you want to measure current. 2. Reconnect the gap using your ammeter as a jumper wire

Measure Current in Series

Vin (6 V)

Vss (Ground)

A

Caution!!!

If you measure Ampsin parallel, you candamage the meter

Measure Resistance out of circuit

Select the ohms mode, remove the resistor to be measured from your circuit, and place the ohmmeter leads across the resistor leads. It is not OK to use your fingers to do this (your body resistance will change result!)

Web References

Learn Electronics Tutorials and Information Pages

http://www.twysted-pair.com/ Electronics Tutorials

http://www.electronics-tutorials.com/ Tutorials for Learning about Electronics

http://www.iguanalabs.com/maintut.htm AC Electricity and Electronics

http://www.sweethaven.com/acee/default.htm

Web References

Jones on Stepper Motors http://www.cs.uiowa.edu/~jones/step/

Holt Software http://www.holtsoft.com/ Turing, Computer Engineering textbooks

Tony’s Website http://www.uoguelph.ca/~antoon/ Many excellent tutorials, example

circuits