Dec 272014
 
GE2524 Multimeter

GE2524 Multimeter

Question: Based on your previous post regarding voltmeters and internal resistance, I can safely assume that an ammeter must also have some internal resistance. What effect does this resistance have on current measurements, and what resistance value would minimize any error it introduces to the reading?

Answer: It is indeed true that an ammeter must have some internal resistance because like a voltmeter, it must draw current from the circuit in order to make its measurement. The similarities between ammeter and voltmeter internal resistances end there, however.

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Nov 242014
 
GE2524 Multimeter

GE2524 Multimeter

Question: Does a voltmeter have any internal resistance, and if so, what, if any, affect does it have on voltage readings?

Answer: Even if you have no electrical experience at all, I would hope that your answer to the first part of the question was, “yes.” Otherwise this would turn out to be an incredibly short post.

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