Question

5 electrical bulb each of 100W works 12 hours each day. Calculate electrical energy consumed in units.

Answer 1

We know,

Power = energy/time

Total power consumed by 5 bulbs per day = 100×5 = 500W

500 = $\frac{Energy}{12}$×60×60;

Energy = 21.6 × ${10}^6$ Joule

No. of units consumed per day is $\frac{21.6\ast {10}^6}{3.6\ast {10}^6}$

= 6 units