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Year 10 - Science

Analysing series circuits: including complex calculations

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 circuit rules and the equation you = V ÷ R to analyse series 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 series 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 V 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 the equation I = V ÷ R is known, rules for current or p.d. need to be applied to find a second.

Vocabulary To Learn

  • electrical current: Electrical current is the amount of charge flowing past a given point in one second.
  • series circuit: A series circuit is an electrical circuit with a single loop.
  • potential difference (p.d.): P.d is a measure of the push an electric field gives to charges.
  • resistance: Resistance is a property of a material that prevents the flow of current.
  • ohms (Ω): Ohms is the unit of resistance.

Common Mistakes To Avoid

  • To solve circuits, 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 series circuit can be applied to find some missing values of current and p.d.

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

Electrical current is the amount of charge flowing past a given point in one second. Include the word in a full scientific explanation, not as a single label.

3. Correct this common scientific misunderstanding.

Mistake: To solve circuits, 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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