The value of one kWh in joule is

The value of one kWh in joule is
| The value of one kWh in joule is

A. 1000

B. 3.6 &times; 10<sup>4</sup>

C. 3.6 &times; 10<sup>5</sup>

D. 3.6 &times; 10<sup>6</sup>

Please scroll down to see the correct answer and solution guide.

Right Answer is: D

SOLUTION

CONCEPT:

  • Power: The rate of work done by the electric energy is called power. It is denoted by P.
    • The SI unit of power is the watt (W).
    • Watt is a small unit that's why kilowatt-hour is used as the unit for electrical energy.
  • 1 unit of electric energy: When one-kilowatt load works for 1 hour then the energy consumed is called 1 unit of electricity.

1 Unit of electricity = 1 KWh = 1000 Watt-hour = 3.6 × 106 J

1 Kilo-watt = 1000 Watt

  • 1 Watt: The energy consumption rate of 1 joule per second is called 1 watt.

EXPLANATION:

Since 1 Kilo-watt = 1000 watt

1 hour = 3600 sec

1 kWh = 1000 × 3600 =  3.6 × 106 J

So option 4 is correct.

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