Series & Parallel Circuits — GCSE Physics Revision
Revise Series & Parallel Circuits for GCSE Physics. Step-by-step explanation, worked examples, common mistakes and exam-style practice aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP.
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Go to Electrical ChargeWhat is Series & Parallel Circuits?
Series & Parallel Circuits is easiest when you compare the two setups rule by rule. In series, current stays the same and potential difference is shared. In parallel, potential difference stays the same across each branch and current is shared between branches. Students usually struggle when they remember one rule correctly but apply it to the wrong circuit type.
Board notes: AQA, Edexcel and OCR all test the same Physics core here, but the exact equation sheet use, practical framing, and tiered difficulty can vary by board.
Step-by-step explanationWorked example
For two identical lamps in series, the total resistance increases, so the current is smaller and both lamps are dimmer. For the same lamps in parallel, each branch gets the full potential difference of the cell, so each lamp is brighter than in series. That comparison earns more marks than isolated definitions.
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Targeted practice plan
- 1Write the core equation or rule for Series & Parallel Circuits, then identify exactly what each symbol means before substituting values.
- 2Do one graph, circuit, or calculation question and mark where units, direction, or sign could have been lost.
- 3Redo the question without notes, keeping every method line visible so the physics and the maths stay connected.
Common mistakes
- 1Applying the series rules to a parallel circuit or vice versa.
- 2Forgetting that adding resistors in series increases total resistance.
- 3Describing current as 'used up' after one component in a circuit.
Series & Parallel Circuits exam questions
Exam-style questions for Series & Parallel Circuits with mark-scheme style solutions and timing practice. Aligned to AQA, Edexcel, OCR, WJEC, Eduqas, CCEA, Cambridge International (CIE), SQA, IB, AP specifications.
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Step-by-step method
Step-by-step explanation
4 steps · Worked method for Series & Parallel Circuits
Core concept
Series & Parallel Circuits is easiest when you compare the two setups rule by rule. In series, current stays the same and potential difference is shared. In parallel, potential difference stays the sa…
Frequently asked questions
What stays the same in series and parallel circuits?
In series, current stays the same through all components. In parallel, potential difference stays the same across each branch.
How should I revise circuit rules quickly?
Use side-by-side comparisons and then test yourself with one brightness or resistance explanation question for each circuit type.