For a light bulb to turn on, the current must make a complete circuit without ever being interrupted: this is a closed circuit.
🔋 The components
A power source (battery), wires, a load (light bulb, motor, buzzer), and optionally a switch.
🔧 What to test
Connect the battery, wires, and light bulb. Is it lit? Disconnect a wire: the circuit is open, and the light bulb turns off. A switch is used to open or close the circuit.
⚗️ Conductor or insulator?
Place an object in the circuit: a key, an eraser, a paper clip, a wooden spoon. Metals conduct electricity, while plastic, wood, and glass insulate.
🤯 Did you know?
Electrical wires are made of copper (a conductor) surrounded by plastic (an insulator) to protect you.
🔬 Safety: only experiment with batteries of 4.5 V or less, never with a wall outlet. Our packs offer ideas for suitable experiments.
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