A Student Finds Two Ancient Meters with Numbered Scales but No

question 2

Multiple Choice

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) B is the voltmeter and A is the ammeter.
• B) A is the voltmeter and B is the ammeter.
• C) A is the voltmeter but B cannot be a useful meter.
• D) B is the voltmeter but A cannot be a useful meter.
• E) neither can be a useful meter.

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Definitions:

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