Electric current and circuits — KCSE Physics
KCSE Physics · 115 practice questions · 11 syllabus objectives
What You'll Learn
Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.
Read and interpret ammeter, voltmeter, and CRO scale readings
Define electric current, potential difference and resistance; state their SI units and measuring instruments
Calculate the equivalent resistance for resistors in series (R = R₁+R₂+...) and in parallel (1/R = 1/R₁+1/R₂+...)
Apply Kirchhoff's current law (sum of currents at a junction = 0) and voltage law to solve circuit problems
Define electric current, potential difference and their SI units; calculate charge given current and time
State Ohm's law, describe verification experiments, and distinguish Ohmic from non-Ohmic conductors
Define resistance and resistivity; state factors affecting resistance of a metallic conductor
Define EMF, describe experiments to determine internal resistance and EMF of a cell, and apply E = V + Ir
Derive and apply formulae for effective resistance of resistors in series and parallel combinations
Solve circuit problems involving current, voltage drops, and complex resistor networks
Electric current and circuits
Sample Questions
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An ammeter is set up in a circuit with a maximum reading of 10 A, divided into 100 equal divisions. (a) What is the value of each division on the ammeter? (1 mark) (b) If the pointer is at the 45th division, what is the current reading? (1 mark)
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State the relationship between current, voltage, and resistance in an electrical circuit according to Ohm's Law. (2 marks)
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State the formula for calculating the effective resistance of three resistors connected in parallel. (3 marks)
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Why Practise Electric current and circuits?
KNEC Aligned
Questions match the KCSE syllabus objectives and exam format exactly.
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