Ohm's Law Calculation for a 60W Filament Lamp

What is the current and resistance of a 60W filament lamp powered by a 240V mains electricity supply?

Calculate the current and resistance of the lamp when switched on.

Answer:

The current in the lamp is 0.25A and the resistance of the lamp is 960 ohms.

Ohm's Law is a fundamental principle in electrical engineering that relates the current (I), voltage (V), and resistance (R) in an electrical circuit. In this scenario, a 60W filament lamp is connected to a 240V mains electricity supply and switched on.

To calculate the current passing through the lamp, we can use Ohm's Law formula: I = P/V, where I is the current, P is the power, and V is the voltage. Given that the power is 60W and the voltage is 240V, we can substitute these values into the formula to find the current: I = 60W / 240V = 0.25A.

Next, to determine the resistance of the lamp, we can use Ohm's Law formula: R = V/I, where R is the resistance. Substituting the values of voltage (240V) and current (0.25A) into the formula, we get: R = 240V / 0.25A = 960 ohms.

Therefore, the current flowing through the 60W filament lamp is 0.25A, and the resistance of the lamp is 960 ohms when connected to the 240V mains electricity supply. Understanding Ohm's Law allows us to calculate these electrical parameters accurately.