Year 8 - Science
Electric current
Series circuits
Study Hub
Study Guides
This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers electric current, potential difference, and resistance in series and parallel circuits. It also explores charge separation, electron transfer, and electric fields. The unit focuses on interpreting data, identifying patterns, and drawing conclusions using scientific knowledge.
Lesson Summary
You will learn to describe how a cell causes current in a circuit and explain the movement of electrons.
Key Notes
- One end of a battery has a positive charge and one end has a negative charge, because of chemical reactions inside it.
- A battery pushes electric charge (electrons) one way round a complete circuit.
- There are electric charges in all atoms of the wires and components in a circuit, even when it is not turned on.
- When a circuit is turned on, electrons everywhere in the circuit start moving at the same time.
- Individual electrons move round a circuit slowly, at a speed of just a few millimetres each second.
Vocabulary To Learn
- electrical cell: An electrical cell is a component that uses a chemical reaction to make electric charge flow in a circuit.
- charge: Objects can have an electrical charge that is positive or negative. If there is no charge, they are neutral.
- electrons: Electrons are the charges in conductors that flow to cause an electric current.
- electric current: Electric current is the flow of electric charge in a circuit.
Common Mistakes To Avoid
- Many pupils imagine electric current to emerge from a battery or a power supply and to move around a circuit in a sequential way. This leads to a consumption model of electricity.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
One end of a battery has a positive charge and one end has a negative charge, because of chemical reactions inside it. A battery pushes electric charge (electrons) one way round a complete circuit.
2. Define this scientific word and use it in context. 'electrical cell'
An electrical cell is a component that uses a chemical reaction to make electric charge flow in a circuit. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Many pupils imagine electric current to emerge from a battery or a power supply and to move around a circuit in a sequential way. This leads to a consumption model of electricity. Correction: Give pupils opportunities to test different incorrect models (e.g. the unipolar and clashing current model,s as well as the consumption model).
More Lessons In This Unit
Browse all guides in the Year 8 Science guide library.