Unit of Power

Power, in general, is defined as the rate at which energy is transferred or converted or the rate of doing work. Thus, power can be calculated using the formula P = W / t. On the other hand, power is a scalar quantity and is basically the amount of energy consumed per unit time which has no direction. While we have already talked about power in our other article, on this page students will find all the information regarding the unit of power.

SI Unit of Power

According to the popular standards, the SI unit of power is none other than watt which is represented by the symbol W). One joule per second is also equal to one watt. Interestingly, the name was kept in recognition of James Watt who invented the condenser for the steam engine. He also coined the term horsepower which is the older unit of power. It can be depicted as;

1 watt = 1 J/s = 1 kg-m2/s3

Other Power Units

Some of the common power units include ergs per second (erg/s), foot-pounds per minute, dBm, food calories per hour or kilocalories per hour, horsepower (hp), BTU per hour (BTU/h).

Units Of Power Conversions

Units

Abbreviation

Equivalent Watt Unit

Horsepower

HP

746 watts

Kilowatts

kW

1×103W

Megawatts

MW

1×106W

Gigawatts

GW

1×109W

decibel-milliwatts

dBm

30 dBm = 1 W

British Thermal Unit

BTU

3.412142 BTU/hr = 1 w

Calories per Second

cal/sec

0.24 calories per second cal/sec = 1 W

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