Download Current – Voltage Graphs

Current – Voltage
Graphs
Aims
(a) define resistance;
(b) select and use the equation for resistance
(c) define the ohm;
(d) state and use Ohm’s law;
(e) describe an experiment to obtain the I–V
characteristics of a resistor at constant
temperature, filament lamp and light-emitting
diode (LED);
Ohms Law
• Ohm's law states that the current through
a conductor is proportional to the voltage
across it provided that the temperature
stays constant.
R = V/I
Definition of the Ohm -
The Test Circuit
Change the
voltage and
measure the
current
A
V
Results
A
V
Current
(A)
Voltage
(V)
Current
(A)
Voltage
(V)
Current
(A)
Voltage
(V)
The Graph
Current
Plot all of your results on the same graph and
then work out V ÷ I for each one
Amps
Voltage
Volts
I
V
V = 5V
V = 10V
V = 15V
I
V
V = 5V
V = 10V
V = 15V
I
0.3 A
0.2 A
0.1 A
V
V = 1V
V = 2V
V = 3V