This exam focus covers Exam Focus within Resistance & Ohm's Law for GCSE Physics. Revise Resistance & Ohm's Law in Electricity for GCSE Physics with 16 exam-style questions and 30 flashcards. This topic shows up very often in GCSE exams, so students should be able to explain it clearly, not just recognise the term. It is section 14 of 16 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
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Examined in Edexcel 1PH0/2 (Paper 2). CP11 (Resistance of a wire) is a Core Practical tested directly — expect method, variables, and analysis questions. "Suggest" questions appear for novel component behaviour. Resistance and Ohm's Law appears in virtually every GCSE Physics exam paper. V-I graphs are a classic "describe and explain" question type.
What examiners love to ask:
- Calculate resistance, voltage or current using V = IR
- Describe and explain the V-I graph for a filament lamp
- Compare V-I graphs of ohmic and non-ohmic components
- Explain how resistance of a metal changes with temperature
- Describe how resistance of a thermistor changes with temperature
- State one use of a thermistor or LDR
- Explain the required practical method for resistance of a wire
Practice questions for Resistance & Ohm's Law
Which of the following best describes electrical resistance?
Explain what is meant by an ohmic conductor.