开关是怎样工作的

认识开关可以接通和断开电路，从而控制灯泡是否发光或蜂鸣器是否发声

Recognise that a switch opens and closes a circuit, controlling whether a lamp lights or a buzzer sounds

学习证据 / Evidence

• 解释开关闭合时电路接通（电流流动），开关断开时电路断路（电流停止）
• 演示在电路中加入一个开关，并用它来控制灯泡或蜂鸣器
• 将开关的概念与家中日常使用的开关联系起来

• 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

评估问题 / Assessment

{{name}}能解释一下拨动电灯开关时，墙里面发生了什么吗——电路是被接通了还是被断开了？

Can {{name}} explain what happens inside the wall when they flip a light switch — that it completes or breaks the electrical loop?