Online Power Calculator

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Power Calculator

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) = V²_(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 Calculatebutton:

Energy & power calculation

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

P_(W) = E_(J) / Δt_(s)

Impedance (Z):
	∠	°	=
Current (I):
	∠	°
Voltage (V):
	∠	°
Power S:
	∠	°	=