单项选择题

A resistance in a circuit of unknown value is to be tested using the voltmeter/ammeter methodTherefore, the meters should be connected with（）.

A.both meters in series with the resistance
B.both meters in parallel with the resistance
C.the ammeter in series and the voltmeter in parallel with the resistance
D.the ammeter in parallel and the voltmeter in series with the resistance

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An accidental path of low resistance, allowing passage of abnormal amount of current is known as a/an（）.

A.open circuit
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Which of the following statements represents the main difference between a relay and a contactor?（）

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Any electric motor can be constructed to be（）.

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