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A rheostat is a mechanically operated variable resistor, consisting of a wire coiled around a rod (or ring) the contact slides over the coil, varying the length of wire that the current passes through, giving an adjustable voltage drop.
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They look like rock on the outside but a gift on the inside
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http://en.wikipedia.org/wiki/Image:Zincbattery.png
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The fundamental difference between a potentiometer (pot) and a rheostat is that the former is a three terminal device, while the latter is a two terminal one. Let's look at both. When we consider either device, we are looking at a resistive element with a "wiper" or "adjustable contact" to which we can attach a wire. The only difference between the two devices is that the resistive element can have an electrical contact (terminal) at both ends or at just one end. The pot has terminals at each end of the resistive element, and the rheostat has a terminal at only one end. Lastly, a pot can be used in place of a rheostat, but not the other way around. Use the links to check facts and lock in the ideas.
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