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Ohm's law - Lab report
Course: Physics II (PHY 220)
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University: Borough of Manhattan Community College
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Ohm’s Law Experiment
Objectives
To verify Ohm’s Law and experimentally, verify the relationship between current, voltage
and resistance in a circuit.
Equipment
•Resistor Box
•DC power supply
•Voltmeter
•Ammeter
Theory
A current is directly proportional to voltage. When a resistance is at stable, is consider to be
following the Ohm’s Law. The symbol for ohm or unit is Ω, and this is representing the re-
sistance. Now, in order to comprehend Ohm’s Law is to imagine like a liquid circuit, we
have our pump (battery; voltage), then it is flowing and meets it’s resistance. This is the im-
portant part of Ohm’s law and the resistance, is that if the resistance is bigger, then less wa-
ter will flow back. Therefore, given voltage, and depending how big the resistance is, then it
will depend how the current will flow through the resistance.
Procedure
I. Variation of Current with Voltage when the resistance is constant.
1. First, set up the following circuit shown below, using a power supply, an ammeter (A), a
voltmeter (V) and one 1000-Ω Resistor (R) from resistor box.
2. Then, let the instructor check the circuit.
3. Later, close the switch and read the voltage and current on the meters.
4. Next, vary the output voltage of the power supply from 0 to 12 V in the increment of 1.5
V and record the readings of the voltage V across the resistor and corresponding current
I through the resistor in Table 1.
5. Repeat this procedure for 1200-Ω Resistor (R) from resistor box.
6. Then, do the graph of the voltage V (vertical axis) versus the electric current I (horizon-
tal axis) for each resistor.
7. Next, calculate the percent error of the actual 1000-Ω Resistor (R) and the experimental
1000-Ω Resistor (R).
8. Finally, repeat step 6 and 7 but for 1200-Ω Resistor (R).
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