What is Electric Energy? Definition & Example
Definition
Electric Energy is the product of Electric Power taken by the device and the time period.
Equation
Electric Energy = Electric Power(Watt) * Time(Hour)
Units
It is measured in Watt-Hour. As Electric Power is measured in Watt and Time is measured in Hour, So Product of Power(Watt) and Time(Hour) is Watt-Hour.
1 Watt-Hour equals to 1 Watt of Power released for 1 Hour. In terms of Joules 1 Watt-Hour equals to 3600 Joules (3.6*10³ Joules) of Energy. Mostly Joule is used as unit of Energy Except Electrical Energy.
Used to Measure Electricity Bill
Since In Asia Electricity Bill is generated by computing No. of Units consumed by the consumer, then multiplying the same with the tariff or rate of one Unit. Unit is calculated with the help of Electric Energy Meter installed at the premises of Consumer.
Let’s take an Example
Consider A consumer consumes 100 Units of Energy. The tariff rate at their area is 5 rupees per unit. What is their Electricity Bill?
Solution : Here No. of Units = 100
Rate of one Unit = 5
Electricity Bill = 100*5 = 500 rupees Answer
Now the Question rises How much one Unit Equals to?
So The answer is One Unit equals to 1 KWH which is unit of Electric Energy,
One KWH equals to 1 KW of Power drawn by the device during one hour.
Also Read:
Example
If A 100 W Bulb glows for 10 Hours then How much Units does it Consume?
Solution: Here Power = 100 W
Time = 10 H
So Electrical Energy = 100*10 = 1000 W-H
1000W-H = 1 KWH = 1 Unit
So If A 100 W Bulb glows or 10 Hours then it consumes 1 Unit, Similarly if it glows for 20 Hours then it consumes 2 Unit.
In a similar fashion we can Calculate Units consumed by different devices used at home and then calculate our Electricity Bill.Â
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