Power Ratings (AQA GCSE Physics Combined Science): Quizzes

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Power Ratings
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What does the power rating of an appliance represent?

Maximum power it can safely operate at

What does an appliance's power rating tell us?

Maximum energy transferred per second

Does a higher power rating always mean more useful energy is transferred?

No, it doesn't

Which equation relates energy transferred to charge and potential difference?

E=QVE=QV

Calculate energy transferred when 10 C10 \text{ C} flows through 5 V5 \text{ V}. Use E=QVE=QV.

50 J50 \text{ J}

Which equation should you use to calculate power from potential difference and current?

P=VIP=VI

Calculate power when P=VIP=VI, with V=12 VV=12 \text{ V} and I=3 AI=3 \text{ A}.

36 W36 \text{ W}

When should you use the equation P=I2RP=I^2R to calculate power?

When you don't know potential difference

Calculate power using P=I2RP=I^2R when I=2 AI=2 \text{ A} and R=5 ΩR=5 \text{ Ω}.

20 W20 \text{ W}

What is the unit for charge in the equation E=QVE=QV?

Coulombs (C)

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