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Write the expressions for the efficiency...

Write the expressions for the efficiency of a full wave rectifier and a half wave rectifier.

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(i) Efficiency of half wave rectifier `( eta)= ( 0.406R_(L))/( r_(f)+ R_(L))`
(ii) Efficiency of full wave rectifier `( eta )= ( 0.812R_(L))/( r_(f)+ R_(L))`
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