Question

An electric bulb of 60 W is used for 6 h per day. Calculate the ‘units’ of energy consumed in one day by the bulb.

Answer 1

Given 

Power = 60 W =\(\frac{60}{1000}\) =0.06 Kw

(∵ 1Kw = 1000 W). 

Time (t) = 6 hours. 

Now 

Power = \(\frac{Energy\,Consumed}{Time\,taken}\) 

⇒ Energy Consumed = Power × Time taken 

= 0.06 × 6 = 0.36kWh 

Hence 0.36 unit of electricity is consumed by a bulb in one day.