WJEC A Level Physics
WJEC A Level Physics 2.2 Resistance Exam Questions
Free WJEC A Level Physics exam questions on 2.2 Resistance, with mark schemes. Covers resistance, I-V characteristics, resistivity and superconductivity.
2.2 Resistance 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.
StemUp mark scheme flashcards
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.
View flashcards
About WJEC A Level Physics 2.2 Resistance
This topic covers how components resist current.
What you need to know
- Ohm's law V = IR for ohmic conductors at constant temperature.
- I-V graphs Resistor, filament lamp and diode characteristics.
- Resistivity R = ρl/A.
- Superconductors Zero resistance below a critical temperature.
Common mistakes in 2.2 Resistance
- Saying a lamp obeys Ohm's law.
- Using diameter rather than area in resistivity.
- Forgetting resistance of metals rises with temperature.
Try three 2.2 Resistance exam-style questions
1. A wire of length 2.0 m and area 1.0 x 10⁻⁷ m² has R = 3.4 Ω. Find resistivity. (1 mark)
Show the mark scheme answer
1.7 x 10⁻⁷ Ω m.
2. Explain the shape of a filament lamp I-V graph. (2 marks)
Show the mark scheme answer
As current rises the filament heats up (1), lattice vibrations increase, so resistance rises and the gradient falls (1).
3. State one use of superconductors. (1 mark)
Show the mark scheme answer
Strong electromagnets in MRI scanners.
2.2 Resistance FAQs
What does Resistance cover?
Ohm's law, I-V characteristics, resistivity and superconductivity.
Which practical links here?
Determining the resistivity of a wire.
Why is the graph through the origin for a resistor?
Resistance is constant.
Revise this topic with flashcards: A Level Physics Flashcards, with mark scheme answers for Anki and Quizlet.
