Science
Energy
Conceptual
8–9 yrs
How switches work
开关的工作原理
Description
Recognise that a switch opens and closes a circuit, controlling whether a lamp lights or a buzzer sounds
Mastery Evidence
- Explain that a closed switch completes the circuit (current flows) and an open switch breaks it (current stops)
- Demonstrate adding a switch to a circuit and using it to control a bulb or buzzer
- Relate the switch concept to everyday switches in the home
Assessment Prompt
Can your child explain what happens inside the wall when they flip a light switch — that it completes or breaks the electrical loop?
Prerequisites 1
Will the bulb light up?
必须先理解完整回路，再学习开关如何断开或闭合回路
Unlocks 1
More batteries, brighter bulb
