Question

An electric heater rated 500 W operates 24 hours/ day. what is the cost of energy to operate it for 20 days at Rs. 2.00 per kWh ?​

Answer 1

Answer :

• Cost of energy = Rs. 480

Step-by-step explanation :

Given that, An electric heater rated 500 W operates 24 hours/ day.

We need to find the cost of energy to operate it for 20 days at Rs. 2.00 per kWh.

Power = 500 W = 500/1000 = 0.5 kW

Enegry consumed in one day :-

→ Enegry = P × t

→ Enegry = (0.5 kW) × 24 h

→ Enegry = 12 kWh

Ennegry consumed in 20 days will be:

→ Enegry = 12 × 20

→ Energy = 240 kWh

So,

→ Cost of enegry = 240 × 2

→ Cost of enegry = Rs. 480

Hence,

• Cost of energy to operate it for 20 days at Rs. 2.00 per kWh is Rs. 480

Answer 2

Answer:

Rs. 480.00

Explanation:

1kW = 1000W

therefore 500W = 0.5kW

20 × 24hrs = 480hrs in total.

0.5kW × 480hrs = 240kWh

if rs. 2 for 1kWh

then, 240kWh × 2 = Rs. 480.