Question

In how much time will a bulb of 100W consume an energy of 2 kWh

Answer 1

The power of a bulb is defined as the energy consumed per unit time.

Mathematically it can be written as -

                         $power=\frac{Energy}{time\ of\ consumption}$

                                $i.e\ P=\frac{E}{t}$

We have P = 100 watt

               E= 2 kWh

                 $=2*10^{3}watt\ hour$

We are asked to calculate the time of consumption.

The time of consumption  $t\ =\ \frac{E}{P}$

                                                 $=\frac{2*10^3\ watt.hour}{100\ watt}$

                                                 $=20\ hour$     [ans]

Answer 2

Answer is below find the attachment

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