Question

Explain the method, with a circuit diagram, to investigate how the resistance of a single lamp changes with potential difference across the lamp.

Answer 1

To investigate how the resistance of a single lamp changes with potential difference, connect the lamp in series with a battery and measure the potential difference and current passing through the lamp. Use Ohm's law to calculate the resistance of the lamp. Graph the potential difference against current to observe the relationship between them.

Step-by-step explanation:

Circuit Diagram

Step-by-step explanation:

1. Connect a single lamp in series with a battery.
2. Measure the potential difference, V, across the lamp using a voltmeter placed in parallel with the lamp.
3. Measure the current, I, passing through the lamp using an ammeter placed in series with the lamp.
4. Repeat steps 2 and 3 for different potential differences across the lamp, ranging from low to high values.
5. Record the potential difference and current values for each measurement.
6. Plot a graph of potential difference, V, against current, I.
7. The resistance of the lamp can be calculated using Ohm's law, R = V/I, where R is resistance, V is potential difference, and I is current.