Unit: Electricity
Year: 1991 Question#: 34
Question: Which circuit shown below could be used to determine the total current and potential difference of a parallel circuit.
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What is this question really asking?
Explanation by: Alon B
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Answer 1
INCORRECT
This answer is incorrect because this circuit is a series and not a parallel circuit.
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Answer 2
INCORRECT
This circuit is a parallel circuit but the voltmeter is placed in a spot where it
will break the circuit and not allow any current to flow through. Remember, little
(almost none) current can flow through a voltmeter The answer is incorrect.
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Answer 3
INCORRECT
This answer is incorrect because the circuit shown is a series and not a parallel
circuit.
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Answer 4
CORRECT
This is the correct answer. The circuit is a parallel circuit and the Ammeter is in
its correct spot where it can measure the total current coming right out of the battery,
and the voltmeter is in a spot where it can measure the totla potential of the circuit. Remember, in a parallel circuit, the total potential difference is the same
as the potential across any branch.
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What's this question really asking?
This question was testing to see if you knew what the difference between a series
circuit and a parallel circuit is, and where the ampmeter and a voltmeter should
be placed to mteasure the total current and total potential difference of a circuit.
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