voltage - current characteristics for a filament lamp
Post on 17-Dec-2015
225 Views
Preview:
TRANSCRIPT
Voltage - Current
Characteristics for a
Filament Lamp
This is a different way to connect the circuit.
This is better than before because you can apply voltages right down to 0V
Connect the power pack to 12V d.c.
Add the push switch.
This could also be an ordinary switch because we know the bulb will get hot anyway in this experiment.
Add the rheostat by connecting to the two coil ends.
1
2
1 2
Add the ammeter and ray box bulb.
Connect to one end of the rheostat coil and to the rheostat slider
1
3
1
3
Finally add the voltmeter
Test the circuit.
Both meters should show positive readings.
If not, reverse the leads.
Take about 10 readings by putting the slider in different positions.
Voltage(V)
Current(A)
Now reverse the power pack leads so the current flows the other way
Both meters should now show negative readings
Take about 10 negative readings by putting the slider in different positions.
Voltage(V)
Current(A)
Now plot a graph of Voltage vs Current
Volt
ag
e
(V)
Current (A)
Draw the best smooth curve through your points
top related