In this article, we will discuss how to calculate kWh but before that lets define a watt. Watt is the SI unit of power, equivalent to one joule per second while a kilowatt is a measure of one thousand watts of electrical power.

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. For example, if you clean your floors with a 2,000-watt vacuum cleaner for one hour, you consume 2 kWh of energy.

### Formula to Calculate kWh.

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

**Example 1:**

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

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

**Example 2:**

Suppose you have ten 75 watts bulbs. If you left them on for 6 hours, determine their kilowatt hour.

**kWh = (Power in Watts x Number of Hours) ÷** **100**0

**= ( 75 x 10 x 6) ÷** **100**0

**= 4.5kWh**

**Example 3:**

If you have a 40 watts kid’s nightlight that stays on for 14 hours everyday. Calculate its kilowatt hour.

**= (40 x 14) ÷** **100**0

**= 0,56 kWh**

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