A student finds two ancient meters with numbered scales but no unit markings. He thinks that one is an ammeter and one is a voltmeter but doesn't know which is which. He measures the resistance of each, finding that meter A has a resistance of 5000 ohms and meter B has a resistance of 0.10 ohm. He can conclude that
A. A is the voltmeter and B is the ammeter.
B. B is the voltmeter but A cannot be a useful meter.
C. A is the voltmeter but B cannot be a useful meter.
D. B is the voltmeter and A is the ammeter.
E. neither can be a useful meter.
Answer: A
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