Watt is the SI unit of power, equivalent to one joule per second.

The kilowatt-hour (kWh) is a unit of energy equivalent to one kilowatt (1 kW) of power expended for one hour (1 h) of time.

** Formula to calculate kilowatt hour.**

To calculate kWh, we multiply the power in watts by the number of hours and then divide by 1000 to get kWh.

**Example:**

Suppose a phone battery of power 200 W lasts for 2 hours. Calculate its kWh.

Therefore, the phone’s battery energy is 0.4 kWh.

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