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Electric power

03 Electricity

ELECTRIC POWER

  • Electric power is the electrical work done per unit time. In other words, it is the rate at which work is done in an electric circuit.
  • Electric power is represented as :

Power = Work doneTiime taken

 

Or  P = Wt

ELECTRIC POWER

  • Electric power is the electrical work done per unit time. In other words, it is the rate at which work is done in an electric circuit.
  • Electric power is represented as :

Power = Work doneTiime taken

 

Or  P = Wt

UNIT OF POWER

The SI unit of electric power is Watt which is denoted by the letter W.
The power of 1 watt is a rate of working of 1 joule per second. That is,

 

1 watt =  joule1 second

FORMULA FOR CALCULATING ELECTRIC POWER

 Electrical Power = Potential difference  × Current

 

P = V × I

 

Also, P is related to Q (electric charge) as:

 

P = VQt

 

where, Q is the charge (in Coulombs)

COMMERCIAL UNIT OF ELECTRICAL ENERGY IS KILOWATT-HOUR

Relation between kilowatt-hour and joule: 1 kilowatt-hour = 1000 watts for 1 hour

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