A sinusoidal alternating current has a maximum value of 4 V. What is the root-mean-square value? Determine the root-mean-square current for a triangular waveform which gave the following mid-ordinate...

A sinusoidal alternating current has a maximum value of 4 V. What is the root-mean-square value?

Determine the root-mean-square current for a triangular waveform which gave the following mid-ordinate values over a full cycle:

current in mA 5 15 25 155 5 15 2 - - 5 155