Science · Stage 4
Simple Circuits
Join a cell, wires and a bulb in one complete loop — add a switch and light it up!
✦ Science📘 Stage 4 · S4⏱ ~11 min🧒 Ages 8–9★ Free to start
build a simple circuit with a cell, wires, a bulb and a switch, and explain how a complete circuit lights the bulb.
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Kavi Lights the Bulb
Kavi clips a tiny bulb 💡, two wires 🔌 and a cell 🔋 together into a ring. Click goes the switch 🔛… and the bulb glows bright! "Look — when every part is joined in one complete loop with no gaps, the electricity can race all the way round and light my bulb. Open the loop and it goes dark. Come build a circuit with me!"
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What your child will learn
1The parts of a simple circuitA simple circuit is made of parts joined in a ring. Tap each part to see the job it does.
2Will the loop light the bulb?A bulb only lights when the loop is complete — every part joined with no gaps. A gap anywhere breaks the loop. Tap the right box!
3Guess first, then check!Good scientists predict, then test. Pick your guess, then tap to check! Tap Next test for more.
4How the electricity flows roundIn a complete loop the electricity never stops — it keeps going round and round. Tap each step to follow it.
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A peek inside
Kavi joins a cell, two wires and a bulb in a ring and closes the switch. The bulb glows 💡. Why does it light?
Every part is joined with no gaps, so the loop is complete. The cell pushes electricity all the way round, through the bulb.
Try this at home: What three parts does a simple circuit need to light a bulb?
Ready to play and learn?
Start the free interactive lesson, or print the handout for screen-free play.
Part of Science · Stage 4 · S4 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.