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(A) In a center-tapped full wave rectifier,the transformer secondary is tapped to provide two equal voltages of opposite polarity. During the positive

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In a full wave rectifier,two diodes work alternately.

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(A) In a center-tapped full wave rectifier,the transformer secondary is tapped to provide two equal voltages of opposite polarity. During the positive half cycle of the input $AC$,one diode is forward-biased and conducts,while the other is reverse-biased. During the negative half cycle,the roles are reversed. Thus,the two diodes work alternately to rectify the complete cycle of the input signal.

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