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12
Q=CV.
O Level · English Medium · Pearson Edexcel · Physics
Electricity, magnetism and circuits
Use charge, stored energy and series/parallel capacitance in an ideal model.
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Learn the idea
Capacitance C=Q/V compares stored charge with potential difference. Stored energy is QV/2. Parallel capacitances add; series capacitances combine reciprocally. These equations describe ideal components; no physical high-voltage experiment is required.
Worked example
For C=2 μF and V=10 V, Q=20 μC and stored energy0.0001 J. Two2 μF capacitors in parallel give4 μF; in series they give1 μF.
- Convert prefixes.
- Identify the arrangement.
- Check charge, voltage and energy units.
Your written practice
Show your working on paper and enter your answer here. If it does not match, compare the model and try again.
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8
Parallel capacitances add.
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3
Reciprocal total=1/6+1/6.
Write in your own words. A guardian or teacher should review this response.
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E=CV²/2=4×10^−6×25/2=5×10^−5 J.
Convert microfarads to farads.
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Show model answer and explanation
E=CV²/2 depends on the square of V.
State fixed capacitance.
Apply the idea
Compare two capacitor arrangements on paper with labelled charge and voltage.
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- Use the stated evidence or givens.
- Show reasoning rather than only a result.
- Review and explain one correction.
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