Question

A $1kW$ heater is meant to operate at $200V$. How many units of electrical energy will it consume in a month (of 30 days) if it operates $10$ $hrs$ daily at the specified voltage (200 V)?

Answer 1

The total electrical energy consumed by an electric appliance in a specified time is given by

$Energy=Power(In$ $kilowatts)\times Time(In$ $hrs)$

$Power=1kW$ $time=30\times 10=300hrs$

$E=1kW\times 300h=300kWh$

300 commercial unit of electric energy.