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## Homework Statement

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.

## Homework Equations

## 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?