Question

. How many joules are contained in one watt hour.

(a) 3.6 x 103 J

(b) 3.3 x 109 J

(c) 0.4 x 8x 10-3 J

(d) (1/8) J.

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Answer 1

Answer:

You need to know about what is

Work=utilization of force (F.S.costitha)

Power =work done per unit time (W/t)

Energy=it is capacity to do work

Now, 1watt=1joule of work /sec

That means, 1watt.sec=1 joule

Now 1watt.hour=1watt.3600sec=1joule ×3600= 3600joule=nearly 860 calories (857.78)

As 1 calorie =4.2 joule (4.18)

There for

1watt hour= 3600joules=860cal

$1KWh=860Kcal$