A householder has a 10.8 kW electric shower installed in the bathroom. Calculate the current drawn from the mains electricity supply by the shower.

90 A

Explanation:

Applying,

P = VI Equation 1

Where P = Power, V = Supply voltage, I = current.

Make I the subject of the equation

I = P/V Equation 2

From the question,

Assuming the Voltage of the main electric supply is 120 V

Given: P = 10.8 kW = 10800 W, V = 120 V (household voltage)

Substitute these values into equation 2

I = 10800/120

I = 90 A

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