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Caption: Rheostat. A rheostat is a variable resistor. A resistance wire is wound around a cylinder, and a moveable contact may be slid along the coil. The further along the coil, the higher the resistance. If both ends of the coil and the contact are connected to a circuit, the rheostat becomes a potentiometer or voltage divider.

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Keywords: circuit, coil, component, contact, demonstration, electric, electrical, electricity, equipment, experiment, experimental, laboratory, moveable, physical, physics, potential difference, potentiometer, resistance, rheostat, school science, science education, slider, sliding, splitter, variable resistor, voltage divider, wire, wound

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