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Edexcel A-level Electricity Introduction Summary notes
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These notes include Formulas, Definitions & Graphs required for the Electricity topic for A-level Edexcel Physics
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Edexcel A-level Electricity Flashcards
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Flashcards
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Some examples from this set of practice questions
1.
What is the definition for the electromotive force (emf)?
Answer: The energy per unit charge converted into electrical energy by the supplied source (battery)
2.
What is the definition for potential difference?
Answer: The difference in electrical energy per unit charge between 2 points in a circuit
3.
How can you determine the emf & internal resistance of a cell?
Answer: - Vary current using a variable resistor - Record corresponding values for current and potential difference - Graph potential difference against current - negative gradient = internal resistance - y-intercept = emf y = mx +c V = -rI + E
4.
State the resistance of a diode when the potential difference is below zero
Answer: Resistance is infinite
5.
What is meant by drift velocity?
Answer: mean velocity of charge carriers
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