This exam tips covers Exam Tips for Potential Difference within Potential Difference for GCSE Physics. Revise Potential Difference in Electricity for GCSE Physics with 14 exam-style questions and 30 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 13 of 14 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
💡 Exam Tips for Potential Difference
🎯 Common Question Types:
- Calculate energy transferred: E = VQ (2 marks)
- Find missing voltage in a series circuit (2 marks)
- State voltage across parallel branches (1 mark)
- Explain voltmeter connection method (2 marks)
- Describe the difference between EMF and p.d. (2 marks)
📝 Key Command Words:
- State — give a brief factual answer, no explanation needed
- Explain — use "because" to give a reason
- Calculate — show the substitution and units
- Compare — identify similarities AND differences
⚠️ Common Mistakes to Avoid:
- Connecting a voltmeter in series — it must be in parallel
- Forgetting that parallel branches ALL have the same voltage
- Confusing EMF (supply) with p.d. (across a component)
- Forgetting units: energy in J, charge in C, voltage in V
- Using E = Pt instead of E = VQ when charge is given
Quick Check: How should a voltmeter be connected in a circuit, and why?
A voltmeter must be connected in parallel — across the component. This is because voltage is the energy difference between two points, so the meter must touch both the entry and exit points of the component simultaneously.
Practice questions for Potential Difference
Which of the following is the correct definition of potential difference?
Explain what is meant by a potential difference of 6 V across a component.