Question

One Kwh is equal to
1. 36 × 10⁵ J
2. 36 × 103 J
3. 3.5 × 106 J
4. 36 × 106 J

Answer 1

Correct Answer - Option 1 : 36 × 10⁵ J

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).

Calculation:

1 kilowatt hour = 1 kilowatt × 1 hour

Writing this in SI units

1000 Watt × 3600 second

3.6 x 106 joule = 36 × 105 J

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.