Question

The number of joules contained in 1 kWh is
(a) 36 × 105 J
(b) 3.6 × 107 J
(c) 36 × 108 J
(d) 3.7 × 107 J​

Answer 1

Option A is the correct answer.... .. .

Answer 2

The number of joules contained in 1 kWh is 36 × 10⁵ J.

• The kilowatt hour is a dimension of work.
• Work, with respect to power and time, is given by the formula,

        $W = P * t$

• Here, W is the work done, P is the power consumed and t is the time period.

• On replacing the terms with their units, the given equation can be written as,

       $joule = kilowatt * hour$

                 $= 1000 W * 3600 s$

                 $= 36 * 10^{5} J$

• Here, W is the symbol of watt and s is the symbol of second.