Transistors — KCSE Physics
KCSE Physics · 112 practice questions · 7 syllabus objectives
What You'll Learn
Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.
Explain the concept of current gain (β = Ic/Ib) and calculate collector current from base current and β
Identify the three terminals (base, collector, emitter) of an NPN and PNP transistor and describe their functions
Describe how a transistor is used as a switch and as an amplifier in simple circuits
Describe transistor as amplifier; identify logic gates and draw truth tables
Distinguish between npn and pnp transistors; draw common-emitter circuits with current directions
Apply IE = IC + IB; calculate base current, collector current, current gain α and β
Transistors
Sample Questions
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List two types of logic gates and state their primary functions. (4 marks)
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A certain transistor has a base current (IB) of 10 mA and a collector current (IC) of 100 mA. Calculate the emitter current (IE) and the current gains α and β. (3 marks)
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Name two key differences between npn and pnp transistors in terms of charge carriers. (2 marks)
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In a common-emitter transistor configuration, a transistor has a base current (Ib) of 2 mA and a current gain (β) of 50. Calculate the collector current (Ic). (3 marks)
Why Practise Transistors?
KNEC Aligned
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