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It is a type of lever that has the resistance (or output force) in the middle and the effort at one side and the fulcrum on the other side of the resistance

Transformer connected to a circuit

The transformer, connected to a circuit, can be used as a power supply with alternating current.

Close-up view of a bulb's filament

The filament is made of a metal with high melting point and it is wound into a double spiral

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