In a flashlight lamp at a voltage of 4.5 V, the current is 0.36 A. Determine the resistance of the lamp

In a flashlight lamp at a voltage of 4.5 V, the current is 0.36 A. Determine the resistance of the lamp coil when it is hot.

Given:

U = 4.5 Volts – voltage in the flashlight lamp;

I = 0.36 Ampere – amperage in a flashlight lamp.

It is required to determine R (Ohm) – the resistance of the coil of the flashlight lamp.

To determine the coil resistance of a flashlight lamp, you must use the following formula (Ohm’s law):

U = I * R, hence:

R = U / I = 4.5 / 0.36 = 12.5 ohms.

Answer: The coil resistance of the flashlight lamp is 12.5 ohms.