Switches control flow

What it is about

Predict the effect of opening/closing a switch.

Year 4 · 8–9 years · 30 challenges

Before you begin

• Lower KS2 enquiry, skeletons, light, materials and fair comparisons.

What the class will do

1. Predict and experiment · 5 challenges

   Predict and test switches

   Use the fixed ideal two-switch series model. Lit tasks require a complete route; every open-switch arrangement is valid for a dark target.

2. Match pairs · 7 challenges

   Match states and gap locations

   Pair each explicit configuration or transition with its unique contact/gap description. Several dark states are different configurations.

3. Choose and explain · 18 challenges

   Explain the changed route

   Use each before/after record to predict the whole loop, preserve uncertainty and apply the classroom safety boundary.

Using it in class

Everyone predicts before a rotating representative acts. The fixed ideal series loop has one cell, bulb and two switches. Dark targets accept any open-switch state. Named configurations use text boards. No mains work. Full bank 35–45 minutes; discussion may take longer.

Give everyone time to think and discuss before one pupil acts at the board. The class explains and confirms together; hints and explanations stay until you move on.

Use an up-to-date browser on a computer connected to a whiteboard or shared display. Touch, mouse and keyboard; optional audio and reduced motion. No pupil accounts or personal devices.

Choose from 5 challenges up to the full activity. Discussion determines the duration: you set the pace.