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Physics Paper 1 · P2 · Lesson 2.15

More practice: electricity calculations

Return here when you are ready to practise the equations one at a time.

Key ideas1 of 4

Start with the units

Write the values, choose an equation, substitute, then calculate.
Current: A · voltage: V · resistance: Ω.
Use seconds for time, watts for power and joules for energy. 1 minute = 60 s; 1 kW = 1000 W.

Equation guide: Q=It, V=IR, P=VI, E=Pt, E=QV. Choose according to the quantities supplied.

This is extra practice with core content, not Higher Tier-only material.

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Topic resources and sources

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 · 6.2.1.2–6.2.2; 6.2.4.1–6.2.4.2. 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.