A correct circuit should have the following basic components. Power supplies, appliances, switches and wires. The power source acts to convert other forms of energy into electrical energy and provide electrical energy; the wires act to connect circuit components and deliver electrical energy to the electrical appliances; the switches control the delivery of electrical energy (current switching); for other forms of energy. If a circuit lacks some of these four basic components, the circuit will not work or be faulty or dangerous (short circuit).
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