Last updated on Sep 22, 2026

Power Ratings (OCR GCSE Physics A (Gateway Science Suite)): Flashcards

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Power Ratings

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Power rating definition

Maximum power an appliance can safely operate at

What power rating tells us

Max energy transferred per second

Higher power rating & useful energy

Doesn't necessarily mean more useful energy transferred

High power rating vs efficiency

May not be as efficient as low power appliance

Energy formula (charge & potential difference)

$E=QV$

Unit for $E$ in $E=QV$

Joules (J)

Unit for $Q$ in $E=QV$

Coulombs (C)

Unit for $V$ (potential difference)

Volts (V)

Power formula (voltage & current)

$P=VI$

Unit for $P$ (power)

Watts (W)

Unit for $I$ (current)

Amps (A)

Power formula (current & resistance)

$P=I^2R$

Unit for $R$ (resistance)

Ohms (Ω)

Explore OCR GCSE Physics A (Gateway Science Suite) Revision Notes by Topics

Current, Potential Difference & Resistance

Series & Parallel Circuits

Energy Transfers

Static Electricity

Explore OCR GCSE Physics A (Gateway Science Suite) Model Answers by Topics

Current, Potential Difference & Resistance

Series & Parallel Circuits

Energy Transfers

Static Electricity

Explore OCR GCSE Physics A (Gateway Science Suite) Quizzes by Topics

Current, Potential Difference & Resistance

Series & Parallel Circuits

Energy Transfers

Static Electricity

Explore OCR GCSE Physics A (Gateway Science Suite) Exam Questions by Topics

Current, Potential Difference & Resistance

Series & Parallel Circuits

Energy Transfers

Static Electricity

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