How to Calculate Current Drawn from Electric Mains Supply

What is the formula to calculate the current drawn from an electric mains supply?

Given two lamps rated at 100W and 60W connected in parallel to a 220V electric mains supply, what current is drawn from the line?

Formula to Calculate Current Drawn

To calculate the current drawn from an electric mains supply, you can use the formula:

Current (I) = Power (P) / Voltage (V)

Now, let's calculate the current drawn from the line with the given data.

When two lamps rated at 100W and 60W are connected in parallel to an electric mains supply with a voltage of 220V, we can calculate the total power consumed in the circuit first.

Total Power = Power of Lamp 1 + Power of Lamp 2

Total Power = 100W + 60W = 160W

Using the formula for Power, we can now calculate the current drawn from the line:

Current (I) = Power (P) / Voltage (V)

Current (I) = 160W / 220V

Current (I) = 0.727 Amps

Therefore, the current drawn from the line when the supply voltage is 220V is 0.727 Amps.