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| Home > Conversion > Electrical calculation > Amps to watts |
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How to convert amps to watts
How to convert electric current in amps (A) to electric power in watts (W).
You can calculate watts from amps and volts, but you can't convert amps to watts since watts and amps units do not measure the same quantity.
DC amps to watts calculation formula
The power P in watts is equal to the current I in amps, times the voltage V in volts:
P(W) = I(A) × V(V)
So watts are equal to amps times volts:
watt = amp × volt
or
W = A × V
Example
What is power consumption in watts when the current is 3A and the voltage supply is 110V?
Answer: the power P is equal to current of 3 amps times the voltage of 110 volts.
P = 3A × 110V = 330W
AC single phase amps to watts calculation formula
The power P in watts is equal to the power factor PF times the current I in amps, times the voltage V in volts:
P(W) = PF × I(A) × V(V)
So watts are equal to power factor times amps times volts:
watt = PF × amp × volt
or
W = PF × A × V
Example
What is power consumption in watts when the power factor is 0.8 and the current is 3A and the voltage supply is 110V?
Answer: the power P is equal to power factor of 0.8 times current of 3 amps times voltage of 110 volts.
P = 0.8 × 3A × 110V = 264W
AC three phase amps to watts calculation formula
The power P in watts is equal to square root of 3 times the power factor PF times the current I in amps, times the voltage V in volts:
P(W) = √3 × PF × I(A) × V(V)
So watts are equal to square root of 3 times power factor PF times amps times volts:
watt = √3 × PF × amp × volt
or
W = √3 × PF × A × V
Example
What is power consumption in watts when the power factor is 0.8 and the current is 3A and the voltage supply is 110V?
Answer: the power P is equal to power factor of 0.8 times current of 3 amps times the voltage of 110 volts.
P = √3 × 0.8 × 3A × 110V = 457W
How to convert watts to amps ►
See also
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