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Year 10 - Science

Analysing parallel circuits

Electric fields and circuit calculations

Unit Summary

This unit covers static electricity, electric fields, and current flow in series and parallel circuits. It explains current, resistance, and potential difference relationships and explores diodes, thermistors, and LDRs. The focus is on calculations, experiments, and accurate measurements.

Lesson Summary

You will learn to use the rules for current and potential difference and the equation you = V ÷ R to analyse parallel circuits.

Key Notes

  • Current can be calculated using the equation: current = p.d. ÷ resistance (I = V ÷ R).
  • The rules of current and p.d. for a parallel circuit can be applied to find some missing values of current and p.d.
  • The equation I = V ÷ R can be rearranged so that either p.d. or R is the subject of the equation.
  • If any two values in the equation I = V ÷ R are known, the third can be calculated.
  • If only one value in I = V ÷ R is shown for a component, circuit rules need to be applied to the rest of the circuit.

Vocabulary To Learn

  • current: the rate of flow of charge in a circuit
  • branch: a separate series loop in a parallel circuit
  • resistance: a property of materials that makes it harder for current to flow
  • potential difference (p.d.): a measure of how 'hard' an electric field can push charge
  • parallel: a type of circuit in which there are two or more separate branches

Common Mistakes To Avoid

  • To solve circuit problems you need only to put numbers into equations.

3 Quick Questions (With Answers)

1. Explain the scientific idea in this lesson using two key points.

Current can be calculated using the equation: current = p.d. ÷ resistance (I = V ÷ R). The rules of current and p.d. for a parallel circuit can be applied to find some missing values of current and p.d.

2. Define this scientific word and use it in context. 'current'

the rate of flow of charge in a circuit. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: To solve circuit problems you need only to put numbers into equations. Correction: Talk through circuits with pupils before analysing them in order to develop an intrinsic understanding of how circuits work; research shows this improves pupils' problem solving ability for electric circuits.

More Lessons In This Unit

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