What do you understand by the units of electrical energy? How many joules of energy is consumed if the electrical meter shows 200 units of energy ? -Science

What do you understand by the units of electrical energy? How many joules of energy is consumed if the electrical meter shows 200 units of energy ? -Science
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Answer :

Unit of electrical  energy is defined as the energy spent or used by electrical appliance at the rate of 1 kw     For (t) hours                                                           1 kwh = 1000 W *3600s                                 = 3.6 * 10^6 Ws                                1 W = 1 joule/1 second                                1 unit = 1 kwh = 3.6* 10^6 J*s                                1 unit = 3.6*10^ J for 400 units,                               400 units= 400* 3.6*10^6 J                                             = 144*10^7 J
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