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Use Ohm’s Law (V = I × R) to solve.
Section A:
1-C, 2-C, 3-B, 4-B, 5-B, 6-C, 7-B, 8-B, 9-B, 10-C
Section B:
Section C:
1-F (conventional current flows + to – outside; electrons flow – to +), 2-F (parallel – each gets full voltage), 3-T, 4-T, 5-F (1 mA = 0.001 A) f2 science electricity exercise top
Section D:
Section E:
Section F:
Common question:
Draw a circuit with a battery, switch, bulb, ammeter (to measure current through bulb), and voltmeter (to measure voltage across bulb).
Correct arrangement:
Exercise: Identify the mistake: “A student connects a voltmeter in series with a bulb. What happens?”
(Answer: Very little current flows because voltmeter has high resistance; bulb barely lights.) Use Ohm’s Law (V = I × R) to solve
Electricity is a fundamental chapter in Form 2 Science that bridges theoretical physics and real-world applications. Mastery requires both conceptual clarity and hands-on problem-solving. This essay outlines essential exercise types, step-by-step solutions, and common pitfalls, serving as a complete revision toolkit.
E1. A hairdryer uses a current of 5 A and has a resistance of 44 Ω.
Calculate the voltage needed to operate it.
(Show formula, working, unit – 5 marks)
E2. A laptop charger supplies 19 V and a current of 2.1 A passes through the laptop.
Calculate the resistance of the laptop.
(Show formula, working, unit – 5 marks) Section A: 1-C, 2-C, 3-B, 4-B, 5-B, 6-C,