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Answer:
1. Battery, bulb, switch and wire.
2. When a light bulb connects to an electrical power supply, an electrical current flows from one metal contact to the other. As the current travels through the wires and the filament, the filament heats up to the point where it begins to emit photons, which are small packets of visible light.
3. The first is there is a broken wire and the bulb did not light this is called a open circuit.The second is there is a wire but not broken and it still lit up this is called parallel circuit.