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Combined Science: Physics

GCSE · Edexcel · foundation

QuestionsFlashcards

Expressing Quantities & SI Units
- Units & Prefixes
  8
- Conversions & Standard Form
  6

Atomic Structure
Radioactive Decay
Dangers of Radiation
- Dangers of Radiation
  5
- Contamination & Irradiation
  6

Magnetism
Electromagnetism & The Motor Effect
- Magnetic Fields in Wires
  6
- Magnetic Fields in Solenoids
  6

Transformers & the National Grid
- The National Grid
  5
- The Ideal Transformer Equation
  3

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, with units?: $P = I \times V$ : power (W) = current (A) × potential difference (V).
How is the power transferred by a circuit device related to the current in it and the p.d. across it?: Power = current × potential difference, so increasing either the current or the p.d. increases the power transferred.
What is the equation for electrical power in terms of current and resistance, with units?: $P = I^2 \times R$ : power (W) = current squared (A²) × resistance (Ω).