Exercise 1 — IGCSE 0654 Jun 2025 Paper 31 Q10
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Cambridge IGCSE·Co-ordinated Sciences 0654·Physics
Current Voltage Resistance
Key knowledge — Electricity Magnetism
Formulas & equations
Ohm's law: V = IR (voltage = current × resistance)Power: P = IV = I²R = V²/REnergy: E = IVt = PtSeries circuit: R_total = R₁ + R₂ + …Parallel circuit: 1/R_total = 1/R₁ + 1/R₂ + …Charge: Q = It (coulombs = amperes × seconds)Transformer: V₁/V₂ = N₁/N₂ (ideal: V₁I₁ = V₂I₂)
Key facts & rules
- Current: flow of charge (electrons in metals). Unit: ampere (A). Measured with ammeter (in series).
- Voltage (pd): energy transferred per unit charge. Unit: volt (V). Measured with voltmeter (in parallel).
- Resistance: opposition to current. Unit: ohm (Ω).
- Series circuit: same current everywhere; voltage splits; resistance adds.
- Parallel circuit: same voltage across each branch; current splits; total resistance less than smallest.
- Direct current (DC): current always in same direction (batteries).
- Alternating current (AC): current reverses direction periodically (mains electricity, 50 Hz in UK).
- Magnetic field: caused by moving charges/current. Right-hand rule for solenoid.
- Motor effect: current-carrying conductor in magnetic field experiences a force (F = BIl).
- Electromagnetic induction: moving conductor in magnetic field (or changing flux) induces EMF.
- Step-up transformer: more turns on secondary → higher voltage, lower current.
- Step-down transformer: fewer turns on secondary → lower voltage, higher current.
IGCSE Physics — Current, voltage & resistance
158 Cambridge IGCSE 0654 questions on current, voltage & resistance, across all three components.
About current, voltage & resistance on IGCSE 0654
Every Cambridge IGCSE Co-ordinated Sciences 0654 question on current, voltage & resistance (Electricity & magnetism, Physics), across all three exam components. Theory and alternative-to-practical come with full mark schemes; multiple choice is interactive — click an option to check it.
Theory
Current, voltage & resistance — Core theory questions20 total · Paper 3
Exercise 2 — IGCSE 0654 Nov 2025 Paper 32 Q10
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Exercise 3 — IGCSE 0654 Nov 2025 Paper 33 Q10
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Current, voltage & resistance — Extended theory questions20 total · Paper 4
Exercise 4 — IGCSE 0654 Mar 2025 Paper 42 Q10
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Exercise 5 — IGCSE 0654 Nov 2025 Paper 43 Q12
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Exercise 6 — IGCSE 0654 Jun 2025 Paper 41 Q12
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Multiple choice
Current, voltage & resistance — Core multiple choice questions49 total · Paper 1
Exercise 1 — IGCSE 0654 May/June 2025 Paper 12 Q36
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Correct answer: D
Exercise 2 — IGCSE 0654 Oct/Nov 2025 Paper 12 Q36
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Correct answer: A
Exercise 3 — IGCSE 0654 March 2025 Paper 12 Q37
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Correct answer: C
Exercise 4 — IGCSE 0654 Oct/Nov 2025 Paper 12 Q37
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Correct answer: B
Current, voltage & resistance — Extended multiple choice questions58 total · Paper 2
Exercise 5 — IGCSE 0654 May/June 2025 Paper 21 Q36
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Correct answer: B
Exercise 6 — IGCSE 0654 Oct/Nov 2025 Paper 21 Q36
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Correct answer: C
Exercise 7 — IGCSE 0654 May/June 2025 Paper 21 Q37
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Correct answer: A
Exercise 8 — IGCSE 0654 May/June 2025 Paper 21 Q38
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Correct answer: B
Alternative to practical
Exercise 1 — IGCSE 0654 May/June 2025 Paper 63 Q5
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Exercise 2 — IGCSE 0654 May/June 2024 Paper 61 Q5
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Exercise 3 — IGCSE 0654 Oct/Nov 2024 Paper 61 Q6
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Exercise 4 — IGCSE 0654 Oct/Nov 2024 Paper 62 Q5
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Exercise 5 — IGCSE 0654 May/June 2024 Paper 63 Q6
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