(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., $D_{1}$ will conduct while $D_{2}$ will not and current in $R_{L}$ will flow from A to B. During second half cycle of input A.C., diode $D_{2}$ will conduct while $D_{1}$ will not conduct and current will again flow from A to B in $R_{L}$ . Hence complete cycle will become unidirectional.

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