Question

An electric heater rated 400 w operates 5 hours/day. What is the
cost of energy to operate it for 30 days at Rs. 3 per unit.​

Answer 1

Answer:

the electric heater rated 400 watt

and the time take 5 hour

put the electrical energy formula

electrical energy = power × time

electrical energy = 400/1000 × 5

electrical energy = 2kwh.

the 2 kwh for per day

and 2 kwh × 30 = 60 KWH.

so, 1kwh = 1unit

then 60 kwh= 60 unit

per unit cost ₹3.

and 60 unit = 60× 3= ₹180.

so the bill is ₹180.