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thermostats
Thermostats regulate the temperature of a system close to a desired setpoint temperature. The thermostat does this by switching on or off to maintain the correct temperature.
A thermostat may be a control unit for a heating system or a component part of a heater. Thermostats may use a variety of sensors to measure the temperature. The output of the sensor then controls the heating apparatus.
rheostats
Resistance in a circuit can be created by using a rheostat. Rheostats are usually designed to handle much higher voltage, current and power than a thermostat.A toroidal coil with the wiper moving over the upper surface of the toroid is the basis of a rheostat. Sometimes a rheostat is made from resistance wire wound on a heat-resisting cylinder, with the slider made from a number of metal fingers that grip lightly onto a small portion of the resistance wire turns.
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