Question

A 2 kW heater, a 200W TV and three 100W lamps are all switched on from 6p.m to 10p.m .What is the total cost at Rs .5.50 per kWh?

Answer 1

Answer:

Given 2KW heater, 200W TV and three 100W lamps , time period t= 6 PM to 10 PM and price 5.50 rupees per KWh

Total time t= 10 PM - 6 PM = 4 hour

Total Watts w= 2000 W+200 W+100 W ×3

=2500 W = 2.5 KW

5.50 rupees per KWh

for 2.5 KWh, total cost = 5.50 × 2.5 rupees

= 13.75 rupees (Answer )