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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