Hi guys, I was wondering, in the process of electrolysis when we are looking at a galvanic CELL, meaning a battery, why is it that when we want to measure the voltage caused by using the two metals of different elements, we connect the voltmeter in series to the external circuit? If you don't really know what I'm talking about, just imagine a galvanic cell: 2 half cells, 2 different elemental metals dipped in solution in both half cells. Electrons flow from more reactive (more lilely to undergo oxidation) to less reactive, through the external circuit. Why is the voltmeter connected in series to the external circuit? I thought voltmeters have infinitely high resistance? Wouldn't this affect the flow of electrons? Thank you!