#### AC power calculation

The voltage V in volts (V) is eqaul to the current I in amps (A) times the impedance Z in ohms (Ω):

*V*_{(V)} = *I*_{(A)} × *Z*_{(Ω)} = *(|**I**|*×*|**Z*|) ∠
(*θ*_{I} + *θ*_{Z})

The complex power S in volt-amps (VA) is equal to the voltage V in volts (V) times the current I in amps (A):

*S*_{(VA)} = *V*_{(V)} × *I*_{(A)} = *(|**V**|*×*|**I*|) ∠
(*θ*_{V} - *θ*_{I})

The real power P in watts (W) is equal to the voltage V in volts (V) times current I in amps (A) times the power factor (cos *φ*):

*P*_{(W)} = *V*_{(V)} × *I*_{(A)} × cos* φ*

The reactive power Q in volt-amps reactive (VAR) is equal to the voltage V in volts (V) times the current I in amps (A) time the sine of the complex power phase angle (*φ*):

*Q*_{(VAR)} = *V*_{(V)} × *I*_{(A)} × sin* φ*

The power factor (FP) is equal to the absolute value of the cosine of the complex power phase angle (*φ*):

*PF* = |cos *φ*|

## Energy & power calculator

Enter **2 ***values* to get the other values and press the *Calculate*button:

#### Energy & power calculation

The average power *P* in watts (W) is equal to the energy consumed *E* in joules (J) divided by time period Δ*t *in seconds (s):

*P*_{(W)} = *E*_{(J)} / Δ*t*_{(s)}