Ohm’s Law
Lab 1 Cycle 1
Physics 202 Lab M 79
February 5, 2007
Abstract
In order to study the relationship between the electrical current flowing though a
circuit element and the voltage applied, we used a variety of resistors to change the
current.
With the addition of different resistors, we were able to detect the voltage drop
across our circuit and determine the correlation between the voltage and amps.
In doing
so, we determined that the resistors caused a linear relationship between the amps and
voltage due to the fact that they obeyed Ohm’s law which says that voltage equals
resistance multiplied by the current.
The automotive bulb created an exponential curve
which shows that it did not obey Ohm’s Law.
Introduction
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Georg Simon Ohm discovered in 1827 that at constant temperature, the current
I
is directly proportional to the potential difference
V
, and is also proportional to the
resistance
R
, giving the equation
I
=
V
/
R
.
Ohm’s Law states that the current that flows
through a conductor is directly proportional to the potential difference between its ends. It
is usually shown as
V
=
IR,
where
V
is the voltage,
I
is the current, and
R
is the resistance
of the conductor. A real life application of ohms law is when the current of a battery can
push through a wire or the water flow that can be pushed through a pipe.
Figure 1: Diagram of Apparatus; voltmeter, ammeter, resistor, and power supply.
Procedure
In order to begin the lab we had to set up a circuit to test the amps and voltage.
It
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 Spring '08
 JOHNSON
 Current, Resistor, Electrical resistance, Georg Simon Ohm

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