單項(xiàng)選擇題

Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions?（）

A.Current and voltage may be in phase
B.Current may lead the voltage
C.Current may lag the voltage
D.All of the above

你可能感興趣的試題

The resistance of a conductor varies （）

A.directly as its length and inversely as its cross-sectional area
B.inversely as its length and directly as its cross-sectional area
C.directly as its length and directly as its cross-sectional area
D.inversely as its length and inversely as its cross-sectional area

單項(xiàng)選擇題

A switchboard for an AC electrical system requires the use of which of the following devices（）.

A.Frequency meter
B.Ohmmeter
C.Induction voltage regulator
D.Current transformer governor

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Possible phase relationships between voltage and current in an alternating current circuit include which of the following conditions?（）

你可能感興趣的試題

The resistance of a conductor varies （）

A switchboard for an AC electrical system requires the use of which of the following devices（）.

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