IUPUI PHYS 251 LAB
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KIRCHHOFF’S LAWS
OBJECTIVE
To calculate the currents in a multiloop circuit using Ohm’s Law and
comparing the results to those calculated with Kirchhoff’s Current and Voltage
Laws
EQUIPMENT
3 battery packs, circuit board, 2 white shunt connectors, 3 red 75-
Ω
resistive
connectors, multimeter
THEORY
•
Kirchhoff’s Current Law:
Σ
I
= 0 at any node.
•
Kirchhoff’s Voltage Law:
Σ
V
= 0 around any loop.
•
Ohm’s Law:
V = IR
for any resistor.
PROCEDURE
1) Measure the resistance of each red
connector (
R
1
,
R
2
,
R
3
).
2) Set up the circuit shown below.
3) Measure the terminal voltage across each battery pack (
E
1
,
E
2
,
E
3
) while
they are powering the circuit board.
4) Measure the voltages across the red connectors (
V
1
,
V
2
,
V
3
) and calculate
their currents using Ohm’s Law:
I
1
=
V
1
/
R
1
,
I
2
=
V
2
/
R
2
,
I
3
=
V
3
/
R
3
.
5) Use Kirchhoff’s Laws to calculate the currents
I
1
,
I
2
, and
I
3
using only
resistances
R
1
,
R
2
,
R
3
and terminal voltages

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