This question already has an answer here:
- Why V rms instead of V average? 5 answers
Why do we use rms values? I can't get my head around why these values are used. I am doing an intro course to elec eng and we get given some values (normally voltages) in rms and others not, and we are expected to calculate other values but I don't know when to calculate rms or when to calculate something else.
I realise that the root-mean-square is different from the mean-root-square or mean of absolute but it seems logical to me to use the mean-root-square not the rms. Why do we want to use the rms? And when do we want to calculate rms instead of another "interpretation" of the value?
I have seen a similar question to this that addresses only power calculations where voltage is squared but we seem to use rms even when we don't square anything and we aren't interested in calculating power...