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Combined Science: Physics

GCSE · Edexcel · higher

QuestionsFlashcards

Expressing Quantities & SI Units
- Units & Prefixes
  7
- Conversions & Standard Form
  7

Atomic Structure
Radioactive Decay
Dangers of Radiation
- Dangers of Radiation
  5
- Contamination & Irradiation
  5

Power, Current & Potential Difference Flashcards

All 3 cards in this deck

What is the equation for electrical power in terms of current and potential difference?: $P = I \times V$ (power in W, current in A, p.d. in V)
What is the equation for electrical power in terms of current and resistance?: $P = I^2 \times R$ (power in W, current in A, resistance in $\Omega$ )
True or false? Doubling the current in a resistor of fixed resistance doubles the power dissipated.: False. $P = I^2R$ , so doubling the current multiplies the power by four.