Wire an LED circuit on a breadboard with a switch

How to do it

Lay out a breadboard. Walk them through what every line means — the rails on each side are continuous; rows in the middle connect across the gap. Wire it up together: 9V battery → red wire to the + rail → push-button switch in row 5 → 330Ω resistor in row 10 → red LED long-leg in row 12, short-leg to the − rail → black wire back to the battery. Push the button. The LED lights. Pull the resistor out and ask 'what happens if we remove this?' Explain why — too much current, dead LED. Don't remove it.

What you'll need

• Beginner breadboard + jumper wires kit

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• LED + resistor variety pack

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• Tactile push-button switches

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• 9V battery + clip

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