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What is si unit of power?

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Anonymous

12y ago
Updated: 8/17/2019

The SI units for mechanical and electrical Power are the Watt (W), and the Watt (electrical) (We) respectively.

Power is the rate of doing work, or that energy is converted. It can be thought of as - "amount of energy used to perform work, or converted from one form to another, in a specified period of time, namely, in a second".

The equation is P=W/t, where P is Power, W is the work done and t is the time taken.


The equation, P=E/t, where E is the amount energy used to do the work, means the same thing.


The unit for Energy is the Joule (J), and the unit for time is the second (s).


Therefore, you should see that the Watt is equal to 1 Joule (J) per second (s).


There is also electrical power which should be considered, and there are a few different formulae depending on whether voltage, current or resistance are being considered.


Electrical power is equal to the amount of current times the voltage, or P=IV
Also, electrical power is equal to the current squared times the resistance, P=I2R


There are other formulae for the average electrical power of a sinusoidal voltage, but this is outwith the scope of this answer.

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Wiki User

12y ago

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