GCSE Physics (AQA)
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Electricity
Series and parallel circuits
Comparing Series & Parallel Circuits
5:54
Parallel Circuits
Spec
4.2.2
- Key formulation rules for series and parallel circuits are important for exams.
- In series circuits, the current through each component is the same.
- In parallel circuits, the total current is the sum of the currents through each branch.
- For potential difference in series circuits, the total is the sum of individual potential differences.
- In parallel circuits, the potential difference across each branch is the same.
- Total resistance in series is the sum of individual resistances.
- In parallel circuits, total resistance is less than individual resistances.
- Adding resistors in series increases total resistance and decreases total current.
- Adding resistors in parallel decreases total resistance and increases total current.
- Ammeters are connected in series with components to measure current.
- Voltmeters are connected in parallel with components to measure potential difference.
- Ammeters have low resistance; voltmeters have high resistance to avoid affecting total circuit resistance.
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