Ohm's law states that the current through a conductor is directly proportional to the voltage applied. The document describes an experiment to demonstrate Ohm's law using a circuit with a fixed resistor. Voltage is varied using a DC power supply while current is measured with an ammeter. Measurements of voltage and current are recorded and their ratio is calculated and found to be approximately constant, demonstrating Ohm's law. A graph of voltage versus current shows a linear relationship, further confirming Ohm's law.

3. Invented by
Georg Simon Ohm
(1787-1854 )

4. What is ohm`s law?

5. Equations:

6.  What is Voltage?
A force that pushes the current through
the circuit. Measured in Voltage(V)
RECAP

7. What is Current?
Current refers to the volume
of electrical flow. Measured
in Amps (A)

8. What is Resistance?
Resistance to the flow of the current.
Measured in Ohms( ).

9. Experiment
Name: Voltage source variable and
resistance fixed.
Equipment:-
1.6 insulated crocodile-clip electrical
wires
2.Ammeter
3.Milliameter
4.Volt meter
5.Variable DC power supply
6. A resistor .

10. Procedure
a) Set up the circuit shown. The length of Eureka wire acts as the
resistance in the circuit.
b) By adjusting the power supply, you can vary the p.d. across the Eureka
wire. The ammeter will show corresponding values of the current through
the wire. Keep the current small so that the temperature of the wire does
not increase. (Adjust the rheostat at the beginning and then keep it
constant.) Record a series of values of p.d. and current.
c) Calculate the ratio p.d./current for each pair of values. Comment on
the result.
D) Draw a graph to represent the same data. From the graph, deduce a
value for the ratio p.d./current.

11. Result
Chart Graph
Vm(V) Im(mA) R=Vm/Im(kΩ)
1.36 1.5 0.906 Ohm
3.00 3.3 0.909 Ohm
4.92 5.2 0.940 Ohm
6.19 6.9 0.908 Ohm
9.12 10.0 0.912 Ohm
11.96 13.0 0.920 Ohm
15.05 16.3 0.923 Ohm
1.36, 1.5
3, 3.33
4.92, 5.2
6.19, 6.9
9.12, 10
11.96, 13
15.05, 16.3
0
2
4
6
8
10
12
14
16
18
0 5 10 15 20
Voltage(V)
C
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r
r
e
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(
m
A
)