subjects · AQA · spec 8463
Physics
5 curated decks for AQA 8463, every card linked to the moment it was explained. Preview one below.
sample deck
GCSE Physics: Electric circuits
Current, potential difference, resistance and Ohm's law.
What is electric current?
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The rate of flow of electric charge around a circuit.
What unit is electric current measured in?
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Amperes (amps).
How is an ammeter connected in a circuit?
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In series, so that the same current flows through it as through the component being measured.
What is potential difference?
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The energy transferred per unit of charge between two points in a circuit.
How is a voltmeter connected in a circuit?
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In parallel across the component.
Resistance is measured in {ohms}.
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ohms
What is Ohm's law?
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V = I × R (potential difference equals current multiplied by resistance).
What happens to total resistance when components are connected in series?
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Their resistances add together to give a larger total resistance.
What happens to total resistance when more parallel branches are added to a circuit?
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The total resistance decreases because there are more paths for the current to take.
What is the same for all components in a series circuit?
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The current.
What does each component receive in a parallel circuit?
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The full potential difference of the supply.
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2 marks · foundation tier
A material has a mass of 1 kg, a specific heat capacity of 631 J/kg°C and a temperature change of 16 °C. Work out the energy transferred. Give your answer in J.
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10096
E = m × c × Δθ = 1 × 631 × 16 = 10096 J.
2 marks · foundation tier
A block has a mass of 73 kg and a volume of 2 m³. Work out the density. Give your answer in kg/m³. Give your answer to 3 significant figures.
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36.5
ρ = m / V = 73 / 2 = 36.5 kg/m³.
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