Question

The input voltage to the series R=4 Ohm and L=1/π Henry,network is expresed as the following Fourier seris;
Vi=(4/π)(sinπt+1/3sin3πt+1/5sin5πt)
1.What is the RMS value of the input voltage ?
2.What is the peak amplitude of the third harmonic of the circuit current response ?

Answer 1

Worked in electronics all my life, but never had to figure that out lol
Looks like a fundamental + 3rd and 5th harmonic. If a lot of the odd order harmonics were present it could be come a square wave. But this solution is above my pay grade. Take it to the physics group and maybe one of them can solve it. Or amistre has a wide range of knowledge, he could solve it too.