Series and parallel circuits — WJEC GCSE Physics
In summary: Series and parallel circuits is a key topic in WJEC GCSE Physics. Key exam tip: Always draw a circuit diagram if one is not provided to help visualize the path of the current.
Exam Tips for Series and parallel circuits
- Always draw a circuit diagram if one is not provided to help visualize the path of the current.
- Remember that for parallel circuits, the potential difference across each branch is equal to the source voltage.
- Check if the question asks for total resistance or individual component values.
- Ensure you can identify the difference between a series and parallel connection in a complex diagram.
Common Mistakes
- Confusing the rules for current and potential difference between series and parallel circuits.
- Incorrectly assuming that adding a resistor in parallel increases the total resistance.
- Failing to recognize that current splits in parallel branches.
- Misinterpreting circuit diagrams when identifying series vs parallel components.
Marking Points
- Current is the same at any point in a single closed loop (series circuit).
- Potential difference is shared between components in a series circuit.
- Total resistance in a series circuit is the sum of individual resistances.
- Potential difference is the same across components in parallel.
- Total current in a parallel circuit is the sum of currents in each branch.
- Adding resistors in series increases total resistance.
- Adding resistors in parallel decreases total resistance.
- Correct use of circuit symbols including diodes, LDRs, and thermistors.
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