Energy Consumption Formula

Energy consumption is the use of power or energy of a system by making use of supply. The consumption is done in Giga Joule per year, kilograms of oil equivalent per year (kg/a), and in Watts.

Formula of Energy Consumption

The energy consumption formula is articulated as,

Energy consumption formula


  • E is energy in kilowatt-hours(kWh),
  • P is power in Watts,
  • t is hours

Energy  Consumption Solved Problems

Here are some cracked examples based on Energy Consumption:

Problem 1: Compute the energy consumption in a system that consumes 190 Watts of power and works for 3 hrs a day.

Given: Power P = 190 W, total number of hours = 3 hrs

Energy consumption formula 1

E =(190*3*60*60)/1000

E =2052 kWh

Therefore, the energy consumption is 2052 kWh

Problem 2: A toy car consumes energy of 500 Watts of power if it works for 2 hrs a day using it. Calculate the energy consumption a day.


Given: Power P = 500 W, total number of hours= 2 hrs

Energy consumption formula 2

E = (500*2*60*60)/1000

E =3600 kWh


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