Physics Paper 1 · P2 · Lesson 2.4
Use the idea first, then one small calculation.
A resistor limits current. Resistance is measured in ohms (Ω). At the same voltage, a larger resistance gives a smaller current.
Compare at the same voltage: changing both voltage and resistance can change the result.
No timer. Read the explanation after each answer.
Daily 5 · Exam practice · Extra calculation practice · A4 revision sheet
Start with lessons 2.1–2.6 for the circuit basics. Lesson 2.15 offers extra calculation practice. The P2 specification content is shared by Foundation and Higher Tier; extra practice is not Higher Tier-only.
AQA Combined Science Trilogy specification · 6.2.1.3–6.2.1.4. Original notes, questions and diagrams. Circuit animations are simplified; motion is deliberately slowed. Measurements and example values are illustrative. All practical circuits use suitable supervised low-voltage apparatus.
Photographs: Photograph of the inside of a UK plug by Alby Reid, Public domain, released by the copyright holder; Electricity pylons near Grafham Water by Mat Fascione, CC BY-SA 2.0; Photoresistor 2 by oomlout, CC BY-SA 2.0. Images displayed without cropping or alteration.
