Supriya has a pre-paid electricity connection at home. On a sultry Sunday afternoon, she checks that she only has ₹9 left in the balance. She wants to use the air conditioner (AC), rated at 1.2 kW. The price of electricity is ₹10 / unit in her area. How long can she run the AC before her balance is over and the power runs out?

Question

Physics

Osborne

20 September, 13:00

Supriya has a pre-paid electricity connection at home. On a sultry Sunday afternoon, she checks that she only has ₹9 left in the balance. She wants to use the air conditioner (AC), rated at 1.2 kW. The price of electricity is ₹10 / unit in her area. How long can she run the AC before her balance is over and the power runs out?

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Answers (1)

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Eduardo Sheppard · Answer 1

Answer: 0.75 hour (s) or 45 minutes

Explanation:

1 unit of electricity = 1kwh

Amount of energy consumed by 1kw load in one hour

Price per unit = ₹10

Air conditioner rating (power) = 1.2Kw

Given that balance = ₹9

Therefore, supriya's total energy cost = energy balance = ₹9

Total energy cost = power in kilowatt * time of operation (in hour) * cost per unit

₹9 = 1.2kw * time * ₹10

₹9 = 12 * time

Time = 9 / 12

Time = 0.75 hours

0.75 * 60 = 45 minutes