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Lesson 5: Investigating bulb brightness

Posing testable questions about circuits and investigating how the number of bulbs in a series circuit affects their brightness.
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Equipment to investigate bulb brightness

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Learning objectives

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Before the lesson

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Lesson plan

1. Recap and recall

Display the Presentation: Sorting materials. Ask the children to decide how to sort the materials into different groups, justifying their decisions. Encourage them to apply the knowledge they gained from the last lesson on electrical conductors and insulators.

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Teach in presentation mode

In this unit

Assessment – Science Y4: Electricity and circuitsLesson 1: Using electricityLesson 2: Building circuitsLesson 3: Switching on and offLesson 4: Investigating electrical conductors and insulators
Lesson 5: Investigating bulb brightness
Lesson 6: Electrical safety
Created by:
Kapow Primary Team
Kapow Primary Team
Our team comprises experienced classroom teachers who love the foundation subjectsFind out more
Maintained by: Kapow Primary teamLast update: 3 July 2026

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