Year 9 - Science
Measuring current in a parallel circuit
Resistance and parallel circuits
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers electrical circuits, compares appliance power ratings, and understands domestic fuel use and costs. It explores electric current, potential difference, resistance, and the differences between conductors and insulators, focusing on calculations and applications in circuits.
Lesson Summary
You will learn to describe how to measure current through each branch of a parallel circuit.
Key Notes
- Current through the battery in a parallel circuit is measured with an ammeter, connected next to one end of the battery.
- There are connections to the rest of the circuit at the ends of each branch in a parallel circuit.
- The current through a branch of a parallel circuit is measured between its connections to the rest of the circuit.
- The current through each branch of a parallel circuit adds up to the total current through the battery.
Vocabulary To Learn
- ammeter: a device that measures the current flowing in a circuit
- amps: the unit that current is measured in (short for amperes), represented by the symbol A
- branch: a separate loop in a parallel circuit
- parallel circuit: a circuit with more than one complete loop, from one end of a battery round to the other end
Common Mistakes To Avoid
- Pupils often analyse circuits sequentially, starting from the battery, which makes predicting what current does at a junction impossible.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Current through the battery in a parallel circuit is measured with an ammeter, connected next to one end of the battery. There are connections to the rest of the circuit at the ends of each branch in a parallel circuit.
2. Define this scientific word and use it in context. 'ammeter'
a device that measures the current flowing in a circuit. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils often analyse circuits sequentially, starting from the battery, which makes predicting what current does at a junction impossible. Correction: Teach pupils to analyse each complete loop of a parallel circuit as whole loops. The currents through each loop then add to give the current through the battery (rather than current from the battery miraculously 'knowing' how to split at a junction).
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