Question

An electrical device consumed 40 kWh of electrical
energy, Express in Joules.​

Answer 1

Answer:

40 kilowatt hour =144000000 joules

Answer 2

Answer:

Explanation:

Given,

Energy consumed = 40 KWh

We know that,

1 W = 1 J / 1 sec

=> 1 KW = 1000 W

1 KWh = 1000 × 60 × 60 = 3600 × 1000 J

Now,

40 KWh = 40 × 3.6 × 10^6 J = 144 × 10^6 J

Hence,

40 KWh = 144 × 10^6 J

'A piece of Supplementary Counsel' :-

• About KWh - The commercial unit of energy is a kilowatt hour.

One kilowatt hour is defined as the amount of electrical energy consumed when an electrical appliance having a power rating of 1 kilowatt is used for 1 hour.

The relation between kWh and J(joule) is:

1kwh = 1kw×1h

1kwh = 1000w×3600s

1kwh = (1000J÷1s)×3600s [1w =1J/1s]

1kwh = 1000J×3600

1kwh = 3600000J

1kwh = 3.6×10^6J