Ohm's law — KCSE Physics
KCSE Physics · 107 practice questions · 9 syllabus objectives
What You'll Learn
Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.
Define EMF, distinguish it from terminal voltage, calculate internal resistance, and solve Wheatstone bridge problems
State Ohm's law and write the formula V = IR; identify ohmic and non-ohmic conductors
Calculate current, voltage or resistance using V = IR and electrical power using P = IV = I²R = V²/R
Plot and interpret an I-V graph; determine resistance from the gradient; identify non-linear behaviour
State Ohm’s law, define resistance, and distinguish between ohmic and non-ohmic conductors
State factors affecting resistance, explain the effect of temperature, and solve resistivity problems
Draw circuit diagrams, describe experiments to verify Ohm’s law, and analyse V-I graphs
Calculate effective resistance for series and parallel combinations and solve circuit problems for current, voltage and power
Ohm's law
Sample Questions
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A circuit consists of a 12 V battery connected in series with two resistors, R1 = 4 Ω and R2 = 6 Ω. (a) Calculate the total resistance of the circuit. (2 marks) (b) Determine the current flowing through the circuit. (2 marks)
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Name two factors that determine whether a material obeys Ohm's law. (2 marks)
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A circuit contains a 12 V battery connected in series with two resistors of 4 Ω and 6 Ω. (a) Calculate the total resistance in the circuit. (2 marks) (b) Determine the current flowing through the circuit. (2 marks)
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Why Practise Ohm's law?
KNEC Aligned
Questions match the KCSE syllabus objectives and exam format exactly.
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