Exercise: Ohms Law for Serial and Parallel Circuits



Exercise: Ohms Law for Serial and Parallel Circuits

Leonard Freise

Bruce Dillon

Lane Matheson

Equipment:

Volt-Ohm-Ammeter

Test Leads (four)

Resistors 50 and 100 (

D.C. Power Supply

Procedure:

Assemble Circuits as shown below:

[pic]

[pic]

Discussion:

Provide students with Ohms Law and demonstrate multimeter to measure voltage and ammeter. Remember voltage is measured in parallel and current is measured in series!

Questions:

1. What would you predict the resistance to be of three 50( resistors in series?

2. How would the current in question 1 vary from start to finish?

3. What would you expect the resistance to be of three 50 ( resistors in series?

[pic]

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Serial Circuit Voltage Measurements

Measure voltage between points:

AB=

BC=

BE=

CD=

DE=

EF=

AF=

Measure current by replacing wire with ammeter between:

AB=

CD=

EF=

Calculate the value of the resistance between points:

BC=

DE=

BE=

What relationship do you observe?

Parallel Circuit

Measure Voltage between points :

AB=

CE=

DF=

GH=

BG=

Measure current by replacing wire with ammeter between:

AB=

BC=

BD=

EG=

FG=

GH=

Calculate the value of the resistance between points:

CE=

DF=

BG=

What relationship do you observe?

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