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An electronic system, with closed loop current flow, and relative electrical potentials present across electrical components.
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Why do we use the RMS but not the fourth root mean quad?
The root mean square can be derived from something more general.
First lets look at the space of T-periodic, real functions. Its inner product is
$$\langle x,y\rangle = \int_0^T x(t)y(t) \mathrm{d} …