Explain the properties of Fourier transform. The input voltage in volts to a series R-L circuit is e(t) =180 sin (314t+100) +56 sin (942t + 350) +...

Explain the properties of Fourier transform.

The input voltage in volts to a series R-L circuit is e(t) =180 sin (314t+100) +56 sin (942t + 350) + 18. The values of r and L are 18 and 0.0413H. Determine

(i)Expression of current

(ii) the rms value of voltage and current.

(iii) the power factor of the circuit