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Question

A certain household has consumed 250units of energy during a month. How much energy is this in joules?


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Solution

Step 1: Definition of 1-Kilowatthour(kWh)

  1. 1kWh is the energy consumed by an appliance of power 1kW when used for 1hour.
  2. It is a commercial unit of electricity.

Step 2: Calculation of energy in Joules(J)

1kWh=1kW×1h=1000W×60×60s=3.6×106J

Therefore, the energy, E is given by:

E=250units=250kWh=250×3.6×106J=900×106J=9×108J

Hence, the household has consumed 9×108J of energy during the month.


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