K.C.S.E Physics Q & A - MODEL 2000PP2QN07
(a) Explain how a p- type semiconductor is made from a pure a semiconductor
(b) The curves in fig 10. Show the output characteristics of a n – p-n transistor in common emitter mode. The p.d of the battery, Vcc is 9.0V and the load resistors RL is 1.8 kohms
i. Draw the circuit diagram for the experiment set- up that may be used to obtain the curves in the figure.
ii. Given that ohm's law for the circuit is VCE = Vcc – IcRL, draw on the same axes, the load line for the circuit ( hint: load - line passes through. (VCE = 0 and Ic = 0)
Drawing load line on graph (see graph)
When IB = 30μA, An alternating signal is fed into the base so that the base current changes by ± 20μA. Use the graph to determine the corresponding change in collector current Ic and hence determine the current gain beta
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FORM I - PHYSICS SYLLABUS
FORM II - PHYSICS SYLLABUS
FORM III - PHYSICS SYLLABUS
FORM IV - PHYSICS SYLLABUS
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