(i) Name two important processes that occur during the formation of a pn junction.
(ii) Draw the circuit diagram of a full wave rectifier along with the input and output waveforms. Briefly explain how the output voltage/current is unidirectional.
(i) Diffusion and Drift or (1/2+1/2) marks
a) Appearence of a BARRIER POTENTIAL across the junction.
b) Formation of a DEPLETION REGION on either side of the junction.
(ii) Circuit diagram (1) marks
Because of (i) the use of the centre tap transformer and (ii) the manner in which the load is connected , the voltage across/current through , the load has the same direction during both halfs of the input wave (1/2) marks