A basic electrical circuit needs a voltage supply (battery or household outlet), wiring to carry electrons to and from the voltage supply to the load, and a load (motor, light, heat element, stereo, blender, whatever).
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complex circuit
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Simple parts of a circuit are switches, light bulb, battery and connecting wires.
When all parts of a circuit are composed of conducting materials, the circuit is said to be closed. One condition could be a closed circuit, however it could be open if the components are not assembled or are assembled incorrectly.
when he connected the parts he got an electric current.