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:

             
  Resistance: R =  
  Current: I =  
  Voltage: V =  
  Power: P =  
             
         
             

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:

           
  Impedance: Z = °  =   
  Current: I = °      
  Voltage: V = °      
  Power: S = °  =   
                       
               
                       

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|) ∠ (θI + θZ)

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|) ∠ (θV - θI)

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:   J  
  Time period   s  
  Average power:   W  
           
       
           

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)

 

Electric power ►

 


See also

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