Measure the amount of current passing through the light bulb and the voltage at the light bulb terminals. Calculate the resistance of the light bulb using the voltage and current. Answer the question.
Recall how current in a circuit and voltage across a circuit are measured. Adjust your power supply to maximum voltage. Measure the current and voltage. Enter the measurement results in the table. Calculate the resistance and wattage of the light bulb.
Test results, resistance and power calculation
| Voltage at the light bulb () | |
| Current through the incandescent lamp () | |
| Incandescent resistance () | |
| Light bulb power () |
What do you think is approximately the resistance of the wires used in the experiment?