1. The problem statement, all variables and given/known data 1)A coil of self inductance of 0.7 Henry is joined in series with a non inductive resistance of 5 ohms. Calculate the wattless and power components as well as total current when connected to a supply of 200 volts at frequency of 50 cycles per second. 2. Relevant equations 3. The attempt at a solution It is given in my book that the power component of current = I(1)[cos(theta)] Where I(1) = Root Mean Square value of total current in the circuit I think theta is the phase difference between current and voltage in circuit Also they say that the wattless component of current = I(1)[sin(theta)] Could somebody please explain, what is the concept behind this?