Determine the resistance of the filament of an electric light bulb if it says 3.5V, 15A?

Given:

U = 3.6 Volts – the voltage for which the operation of the light bulb is designed;

I = 15 Amperes – the current that will be in the light bulb circuit at a voltage equal to U.

It is required to determine R (Ohm) – the resistance of the light bulb.

To determine the resistance of a light bulb, you must use the following formula (Ohm’s law):

U = I * R, from here we find that:

R = U / I;

R = 3.6 / 15 = 0.24 Ohm (240 mOhm).

Answer: the resistance of the light bulb is 0.24 ohms (240 mΩ).