An ideal ammeter is one that does not change the behavior of a circuit when it i

Question

An ideal ammeter is one that does not change the behavior of a circuit when it is properly used to measure current. The internal resistance of such a meter is:
a) infinite.
b) 0 ?.
c) the same resistance as the circuit.
d) dependent on the circuit.
e) cannot be determined

Explanation / Answer

ZERO EXPLANATION For an Ammeter the internal resistance is zero, because with the formula V=IR => I=V/R as the resistance approaches 0 the current drawn by the ammeter approaches infinity and infinity current is comparable to a shorted wire or as if there is nothing (no ammeter) there. An Voltmeter on the other hand is just the opposite ideally you want it to have infinite resistance because using the voltage divider formula there is no voltage drop across the infinite resistance junction so it acts like an open circuit.

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