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How to convert watts to amps
How to convert electric power in watts (W) to electric current in amps (A).
You can calculate amps from watts and volts, but you can't convert watts to since watts and amps units do not measure the same quantity.
DC watts to amps calculation formula
The current I in amps is equal to the power P in watts, divided by the voltage V in volts:
I(A) = P(W) / V(V)
So amps are equal to watts divided by volts.
amp = watt / volt
or
A = W / V
Example
What is the current in amps when the power consumption is 330 watts and the voltage supply is 110 volts?
I = 330W / 110V = 3A
AC single phase watts to amps calculation formula
The current I in amps is equal to the power P in watts, divided by the power factor PF times the voltage V in volts:
I(A) = P(W) / (PF × V(V) )
So amps are equal to watts divided by power factor times volts.
amps = watts / (PF × volts)
or
A = W / (PF × V)
Example
What is the current in amps when the power consumption is 330 watts, the power factor is 0.8 and the voltage supply is 110 volts?
I = 330W / (0.8 × 110V) = 3.75A
AC three phase watts to amps calculation formula
The current I in amps is equal to the power P in watts, divided by square root of 3 times the power factor times the voltage V in volts:
I(A) = P(W) / (√3 × PF × V(V) )
So amps are equal to watts divided by square root of 3 times power factor times volts.
amps = watts / (√3 × PF × volts)
or
A = W / (√3 × PF × V)
Example
What is the current in amps when the power consumption is 330 watts, the power factor is 0.8 and the voltage supply is 110 volts?
I = 330W / (√3 × 0.8 × 110V) = 2.165A
How to convert amps to watts ►
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