Question

An electric refrigerator rated 600 w operates 5hour/day .what is the cost of the energy to operate it for 20 days at Rs 400 per kw / hr
​

Answer 1

$\star\:\:\:\bf\large\underline\purple{Given:—}$

An electric refrigerator rated 600 w operates 5 hours/day.

$\star\:\:\:\large\underline\purple{To\:find:—}$

What is the cost of energy to operate it for 20 days at Rs. 400 per kw/hr ?

$\star\:\:\:\bf\large\underline\purple{Solution:—}$

$\boxed{\bf{\red{Energy\:of\:one\:day=Power×time}}}$

Energy = 600 w × 5 h

= 3000 Wh

= 3 kWh

Therefore, energy of 20 days=3 × 20 kWh

= 60 kWh

So, cost of energy

= 60 × 400

= Rs. 24000

Hence,cost of the energy is Rs.24000

___________________________