Question 1

The commercial unit of electrical energy is kilowatt-hour (1 kWh). How many Joules (J) are equal to 1 kWh?

Accepted Answer

Correct Option: (B) 3.6 × 10⁶ J Calculation & Explanation: 1 kWh represents the energy consumed by an appliance of 1 kilowatt power in 1 hour. $$1	ext{ kWh} = 1	ext{ kW} 	imes 1	ext{ hour}$$ $$1	ext{ kWh} = 1000	ext{ Watts} 	imes 3600	ext{ seconds}$$ $$1	ext{ kWh} = 3,600,000	ext{ Joules}

Question 2

The commercial unit of electrical energy is .

Accepted Answer

kilowatt-hour

Question 3

The rate of doing work is called .

Accepted Answer

power

Work and Energy