subject

Question Image Which of the following statements about
an alternating current are correct?
(1) It flows backwards and forwards in a
circuit.
(2) In Hong Kong, mains sockets supply
alternating currents.
(3) In the mains circuit in Hong Kong,
the frequency of the current is 50 Hz.
nd (3) on
) and (2) on

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Answers: 3

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Question Image Which of the following statements about
an alternating current are correct?

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