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Edexcel A-level Electricity Flashcards
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What is the definition for potential difference?
What is the definition for potential difference?
The difference in electrical energy per unit charge between 2 points in a circuit
How can you determine the emf & internal resistance of a cell?
How can you determine the emf & internal resistance of a cell?
- 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
Explain the shape of a current potential difference graph for a filament bulb
Explain the shape of a current potential difference graph for a filament bulb
- As potential difference increases, current increases
- This causes the temperature to increase
- Therefore resistance increases
- And rate of change of gradient decreases
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