Alternating current is a current that changes its magnitude and polarity at regular interval of time. If the current maintains its direction constant it is called direct current.
Root Mean Square
The Root mean square of a function from T1 to T2 is given by
Power Consumed or Supplied in AC circuit
The average power consumed in a cycle
Purely Resistive Circuit
In a purely resistive circuit, the power is dissipated by the resistance and phase of both voltage and current remains the same.
Pure Inductive Circuit
In a purely inductive circuit current lags the voltage by 900
i = imsin(ωt- π/2)
Purely Conductive Circuit
In a purely inductive circuit, the current flowing through the capacitor leads the voltage by 900.