A variable resistor which is used to control current.
Typically a rheostat consists of a resistance element equipped with two contacts, or terminals, by which it is attached to a circuit: a fixed contact at one end and a sliding contact that can be moved along the resistance element. Electric current enters and leaves the resistance element through the contacts. Rheostat. an electric device for controlling and limiting current or voltage in an electric circuit. The principal component of a rheostat is a conducting element with variable resistance. The magnitude of this resistance may be varied smoothly or in discrete steps. A rheostat is a device which is used to vary the resistance in an electrical circuit without interrupting the circuit. Rheostats are a kind of potentiometer. These devices can be used in a variety of settings, and are usually designed to be sealed so that environmental factors cannot interfere with the function of 2. Rheostats in cathodic protection. a rheostat is a resistor used to adjust current in a circuit. can any body please tell me what is the use of ammeter. An ammeter measures the electric current in a circuit. It is a type of potentiometer that has two terminals instead of three. The two main types of rheostat are the rotary and slider. The symbol for a rheostat is a resistor symbol with an arrow diagonally across it. Rheostats. A rheostat is an electrical component that has an adjustable resistance. It is a type of potentiometer that has two terminals instead of three. The two main types of rheostat are the rotary and slider. The symbol for a rheostat is a resistor symbol with an arrow diagonally across it. A rheostat is a variable resistor which is used to control current. They are able to vary the resistance in a circuit without interruption. The construction is very similar to the construction of a potentiometer s. It uses only two connections, even when 3 terminals (as in a potentiometer) are present.  A rheostat is an adjustable resistor that is used to control the electrical resistance of a circuit without interrupting the flow of electrical current to that circuit. Rheostats are used for appliances and other items that need both high voltage and electrical current that can be interrupted. GSK · 4 years ago. Report Abuse. A rheostat is simply a coil of resistance wire with a slider on it so that the resistance can be varied. The list of ways that it can be used is very long. Prior to solid state devices they have been used to control lighting or battery charging. speed control of motors. production of variable emf etc. A rheostat is a type of electrical component that provides the capacity to adjust resistance to electrical current. A rheostat is a device with a resistance to electric current is dependent on the position of some type of mechanical element... For the measuring instrument, see Potentiometer (measuring instrument) . A potentiometer /pɵˌtɛnʃiˈɒmɨtər/ , informally a pot, is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat. The measuring instrument called a potentiometer is essentially a voltage divider used for measuring electric potential (voltage); the component is an implementation of the same principle, hence its name. 
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what is a rheostat