WJEC A Level Physics
WJEC A Level Physics 2.3 D.C. Circuits Exam Questions
Free WJEC A Level Physics exam questions on 2.3 D.C. Circuits, with mark schemes. Covers series and parallel circuits, Kirchhoff's laws, potential dividers, emf and internal resistance.
2.3 D.C. Circuits exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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A Level Physics Flashcards
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Pick your exam board, then test yourself with the questions on this page.
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About WJEC A Level Physics 2.3 D.C. Circuits
This topic covers circuit analysis.
What you need to know
- Kirchhoff's laws Conservation of charge at junctions and energy around loops.
- Combining resistors Series and parallel formulas.
- Potential dividers Vout = V x R2/(R1 + R2), with LDRs and thermistors.
- Internal resistance V = E − Ir.
Common mistakes in 2.3 D.C. Circuits
- Adding parallel resistances directly.
- Forgetting lost volts.
- Getting potential divider output on the wrong resistor.
Try three 2.3 D.C. Circuits exam-style questions
1. Find the total resistance of 6 Ω and 3 Ω in parallel. (1 mark)
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2 Ω.
2. A cell of emf 1.5 V and internal resistance 0.50 Ω supplies 0.60 A. Find the terminal pd. (1 mark)
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1.2 V.
3. Describe how to find internal resistance experimentally. (2 marks)
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Measure V and I for different loads (1); plot V against I, gradient is −r and intercept is E (1).
2.3 D.C. Circuits FAQs
What does D.C. Circuits cover?
Kirchhoff's laws, resistor networks, potential dividers and internal resistance.
Which practical links here?
Determining emf and internal resistance of a cell.
How does a thermistor divider work?
Its resistance falls as temperature rises, changing the output voltage.
Revise this topic with flashcards: A Level Physics Flashcards, with mark scheme answers for Anki and Quizlet.
