Question

Kilo-Watt-Hour is the unit of-
1. Electric power
2. Energy
3. Impulse
4. Rate of Power

Answer 1

Correct Answer - Option 2 : Energy

CONCEPT:

• Electrical energy: The energy that is derived from the flow of electric charge is called electrical energy.
  • The SI unit of electrical energy is Joule.
• Kilowatt-hour: It is the unit of energy and is equal to the energy consumed in the circuit at the rate of 1 kilowatt for 1 hour.
  • The commercial unit of electrical energy is a kilowatt-hour (kWh).
• Electric Power: The rate at which electrical energy is consumed in a circuit is called electric power.
  • SI unit is the watt.
  • One Kilowatt is equal to 1000 watts.

EXPLANATION:

• The commercial unit of electrical energy is a kilowatt-hour (kWh). Therefore option 2 is correct.

• The commercial unit of electric energy is the kilowatt or the Board of Trade (B.O.T) unit.
• One kilowatt-hour is defined as the electric energy consumed by the appliance of 1 kilowatt in one hour and it is also called one unit of energy.

1 kilowatt-hour = 1 kilowatt × 1 hours = 1000 watt × 3600 s

1 kWh = 3600000 joules = 3.6 × 106 J = 1 Unit of energy