# Power Calculator

Power consumption calculator: calculates electric power / voltage / current / resistance.

## DC power calculator

Enter **2 values** to get the other values and press the

*Calculate*button:

#### DC power calculation

Voltage (V) calculation from current (I) and resistance (R):

*V*_{(V)} = *I*_{(A)} × *R*_{(Ω)}

Complex power (S) calculation from voltage (V) and current (I):

*P*_{(W)} = *V*_{(V)} × *I*_{(A)} = *V*^{ 2}_{(V)} / *R*_{(Ω)} = *I*
^{2}_{(A)} × *R*_{(Ω)}

## AC power calculator

Enter **2 values** to get the other values and press the

*Calculate*button:

#### 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)}