Electric power

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 :

$Power = \frac{Work done}{Tiime taken}$

$Or P = \frac{W}{t}$

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 :

$Power = \frac{Work done}{Tiime taken}$

$Or P = \frac{W}{t}$

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,

$1 watt = \frac{ joule}{1 second}$

FORMULA FOR CALCULATING ELECTRIC POWER

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

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