Current, Resistance and Potential Difference
The current through a component depends on both the resistance of the component and the potential difference across it.
Full topic guide: the detailed syllabus page with worked examples and common mistakes lives at studyvector.co.uk/gcse/physics/electricity/potential-difference.
Topic preview: Current, Resistance and Potential Difference
Sample stems from the StudyVector question bank (AQA · Edexcel · OCR) — not generic filler text.
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Coverage and provenance
What this page is based on
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Topic explanation
Potential difference (also known as voltage) is the work done per unit of charge that passes between two points in a circuit. It is the 'push' that makes the electric charge move. Potential difference is measured in Volts (V), and a larger potential difference results in a larger current for a given resistance.
Current, Resistance and Potential Difference is easiest to revise when it is treated as a precise exam behaviour, not a loose note-taking category. In GCSE Physics, the goal is to recognise how the topic appears in a question, identify the command word, and decide what evidence, method, or vocabulary earns marks. StudyVector keeps this page tied to AQA · Edexcel · OCR language where coverage is available, then routes practice towards the same topic so revision moves from explanation into retrieval.
A strong revision session starts with a short recall check. Write down the rule, definition, process, or method linked to Current, Resistance and Potential Difference before looking at any notes. Then answer one exam-style prompt and compare your answer with the mark-scheme logic: did you make a clear point, support it with the right step, and avoid drifting into a nearby topic? This matters because many lost marks come from almost-correct answers that do not match the expected structure.
Use this guide as the first layer: understand the topic, look at the worked examples, complete the mini quiz, then move into full practice. The full StudyVector practice loop is designed to capture whether mistakes are caused by knowledge, method, language, or timing. That distinction is important. If the error is factual, you need reteaching. If the error is method-based, you need a worked retry. If the error is wording, you need command-word calibration. That is how Current, Resistance and Potential Difference becomes a controlled revision target rather than another page in a folder.
Lost marks → repair task
Why marks are usually lost here
These are the error patterns StudyVector looks for after an attempt. The goal is not a generic explanation; it is one repair move and one follow-up question.
Unit, formula, or method slip
Examiner move: Select the correct method and keep units, substitutions, signs, and rounding visible.
Repair drill: Redo the calculation or method line slowly, naming the formula before substituting values.
Missing chain of reasoning
Examiner move: Show the link between point, method, evidence, and conclusion instead of jumping to the final line.
Repair drill: Write the missing because/therefore step, then retry one isomorphic question.
Weak evidence or data reference
Examiner move: Use a precise value, quote, example, diagram feature, or syllabus term to support the claim.
Repair drill: Add one concrete reference to the answer and remove any generic sentence that does not earn a mark.
Mini quiz
Use these checks before full practice. They test topic recognition, exam technique, and whether you can connect the explanation to a marked response.
1. What should you check first when a Current, Resistance and Potential Difference question appears in GCSE Physics?
- A.The command word and the exact topic focus
- B.The longest paragraph in your notes
- C.A memorised answer from a different topic
2. Which revision action gives the strongest evidence that Current, Resistance and Potential Difference is improving?
- A.Rereading the explanation twice
- B.Answering a timed exam-style question and reviewing lost marks
- C.Highlighting every key phrase in the topic notes
Sample questions
Topic-specific public question previews are still being reviewed. We keep them off public pages until the topic match is safe.
Exam tips
- Read the command word carefully — "explain" needs reasons; "state" expects a short fact.
- For Current, Resistance and Potential Difference, show structured working even when you are practising multiple choice — it builds accuracy under time pressure.
- Mark yourself against the mark scheme style: one clear point per mark, in logical order.
- Come back to this topic after a day or two; short spaced reviews beat one long cram.
Worked examples
Example 1
Modelled exam response
If 100J of work is done when 20C of charge moves between two points, what is the potential difference? Solution: Potential Difference = Work Done / Charge. V = 100J / 20C = 5V.
Example 2
Identify the task before answering
Question type: a Current, Resistance and Potential Difference prompt asks for a clear response in GCSE Physics. Step 1: underline the command word. Step 2: name the exact part of Current, Resistance and Potential Difference being tested. Step 3: decide whether the mark scheme wants a definition, method, explanation, comparison, or calculation. Why it works: most weak answers fail before the content starts because they answer the topic generally rather than the exact exam task.
Example 3
Turn feedback into a repair task
Suppose your answer shows partial understanding but loses marks for precision. First, rewrite the missing mark as a short target: "I need to state the mechanism, unit, reason, or evidence explicitly." Then answer one similar question without notes. Finally, compare the second attempt with the first and check whether the same mark was recovered. Why it works: Current, Resistance and Potential Difference improves faster when feedback creates a specific retry, not another passive reading session.
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Common mistakes
- Thinking that potential difference 'flows' through a circuit. It is a difference between two points, not a flow of something.
- Confusing potential difference with electromotive force (e.m.f.). While both are measured in Volts, e.m.f. refers to the energy supplied by a source (like a battery), whereas potential difference refers to the energy used by a component.
- Incorrectly using a voltmeter. A voltmeter must be connected in parallel across the component you are measuring the potential difference of.
Exam board notes
A fundamental concept for all GCSE Physics boards (AQA, Edexcel, OCR).
FAQs
What is the difference between voltage and potential difference?
The terms are often used interchangeably. Potential difference is the more formal term for the work done per unit charge between two points.
How do you measure potential difference?
Potential difference is measured using a voltmeter, which is always connected in parallel with the component being measured.
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