Question

It would cost a man Rs. 3.50 to buy 1.0 kW h of electrical energy from the

Main Electricity Board. His generator has a maximum power of 2.0 kW.

The generator produces energy at this maximum power for 3 hours.

Calculate how much it would cost to buy the same amount of energy from

the Main Electricity Board.
Plz Answer this No Spams​

Answer 1

It would cost Rs 21 to buy the same amount of energy from the Main Electricity Board if generator has a maximum power of 2.0 kW and run for 3 hrs.

Given:

• It cost Rs. 3.50 to buy 1.0 kW h of electrical energy from the Main Electricity Board
• Generator has a maximum power of 2.0 kW and produces energy at this maximum power for 3 hours

To Find:

• Cost to buy the same amount of energy from the Main Electricity Board

Solution:

• Energy = Power x Time

Step 1:

Find energy produced by generator in 3 hrs at  2 kW

Energy produced = 2 x 3  = 6 kWh

Step 2:

Find cost of 6 kWh when cost of 1 kWh is Rs 3.5

Cost of 1 kWh = Rs 3.5

Cost of 6 kWh = Rs 3.5 x 6  = Rs 21

Hence, It would cost Rs 21 to buy the same amount of energy from the Main Electricity Board.

Answer 2

Answer:

(a) E = P X T

SO, E = 3X2 = 6 kWh

Cost of buying electricity from the main electricity board = 6 x 3.50 = Rs. 21.0

(b) To reduce the boiling time using the same mains supply, the rate of heat production should be large. We know that P= V 2 /R. Since V is constant, R should be decreased. Since R is directly proportional to l so length should be decreased

Explanation:

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