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Question

(a) In the following diagram, is the junction diode forward biased or reverse biased ?

(b) Draw the circuit diagram of a full wave rectifier and state how it works.

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Solution

(a) The diode is reverse biased.
(b) Full wave Rectifier :

Diode conducts only when the junction is forward biased. Hence during first half cycle of input A.C., D1 will conduct while D2 will not and current in RL will flow from A to B. During second half cycle of input A.C., diode D2 will conduct while D1 will not conduct and current will again flow from A to B in RL. Hence complete cycle will become unidirectional.

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