你可能感興趣的試題

單項(xiàng)選擇題

If the length of a wire is halved and the cross-sectional area is doubled, the resistance will be （）

A.quartered
B.unchanged
C.doubled
D.quadrupled

單項(xiàng)選擇題

AC and DC generators are similar in that they （）

A.both generate alternating voltages
B.both rectify the voltage before delivery
C.are constructed at the same physical size for the same kilowatt rating
D.both supply three-phase power

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Which of the following devices are protected from being motorized by a reverse-power relay?（）

你可能感興趣的試題

If the length of a wire is halved and the cross-sectional area is doubled, the resistance will be （）

AC and DC generators are similar in that they （）