simulate this circuit – Schematic created using CircuitLab
Note difference when Magnet moves inside coil vs outside with fringe effects.
Fleming's Rule with coil orientation determines polarity.
Using a precision full-wave peak detector with a dual Op Amp and 2 diodes + R's, you can measure Voc ( open-cct) or no-load voltage with a DMM. Or you can measure each polarity independently. This is just voltage potential from Faraday's Law of Induction and not power from Joule–Lenz's law. P=I²R ( sometimes linked to Ohm's Law )
Then you can use a load shunt R to measure near short circuit current , Isc using the same cct to measure Ipp current.
- The power it can generate will be about 1/2 to 2/3 of the VI product.
- recall that generators like motors have a no load voltage kV/RPM and a short circuit current and the max Power can be 1/2 to 3/4 of no load max speed
There are various Full wave and Half wave precision rectifiers circuits which have a low frequency cutoff determined by input RC=T1 value and peak and hold decay time by output RC=T2 decay time.
There are many other variations with comparator, analog switch and
only 1 diode (half) 2 diodes (full) with some limitations