Electromagnetic induction — KCSE Physics
KCSE Physics · 118 practice questions · 10 syllabus objectives
What You'll Learn
Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.
Describe applications of electromagnetic induction: microphone, induction coil, national grid, high-voltage transmission
State Faraday's law and Lenz's law; explain how a changing magnetic flux induces an EMF
Describe the working principle of an AC generator and state factors that affect the magnitude of induced EMF
Apply the transformer equations (Vp/Vs = Np/Ns and Vp×Ip = Vs×Is for 100% efficiency) to solve transformer problems
State Faraday's and Lenz's laws of electromagnetic induction; describe experiments to demonstrate them
Explain mutual induction and its effects in coupled coils
Identify parts of AC and DC generators; explain operation and sketch output waveforms
State and apply Fleming's right-hand rule to determine direction of induced current
Explain transformer operation, calculate turns/voltage ratios, determine efficiency, and describe methods of reducing energy losses
Electromagnetic induction
Sample Questions
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A transformer has a primary coil with 200 turns and a secondary coil with 50 turns. (a) Calculate the turns ratio of the transformer. (2 marks) (b) If the primary voltage is 240 V, determine the secondary voltage. (2 marks)
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State two factors that affect the magnitude of induced EMF in an AC generator. (2 marks)
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State the principle of operation of an AC generator. (2 marks)
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Why Practise Electromagnetic induction?
KNEC Aligned
Questions match the KCSE syllabus objectives and exam format exactly.
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