How to Calculate the Resistance of a Light Bulb

Question:

A light bulb for a flashlight consumes 3.0 W power when 3.0 V voltage is applied to it. What is the resistance of the light bulb?

Answer:

The resistance of the light bulb is 1.0 ohm.

When calculating the resistance of a light bulb, Ohm's law can be used. Ohm's law states that resistance (R) is equal to the voltage (V) divided by the current (I): R = V/I. In this case, the voltage applied to the light bulb is 3.0 V and the power consumed is 3.0 W.

The power (P) can also be related to voltage and current through the equation P = IV. By using these equations, we can calculate the current and then determine the resistance of the light bulb.

Therefore, the resistance of the light bulb can be calculated as follows: Resistance = Voltage / Current. Substituting the values, we get: Resistance = 3.0 V / 3.0 A = 1.0 ohm.