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Difference between variable resistor and rheostat?


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Answered 2010-01-28 16:42:43

The difference between a variable resistor and a rheostat is the same as the difference between six and half a dozen.

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It is a variable resistor. Basically, the same as when you turn up or down the heat on an electrical oven or radio.


its the colour of the fixed and the variable we define it by its power and name


Variable resistors means that a resistor which can change its resistance by control by any person or it self and fixed resistor means that it can not change its value.


These devices could, in theory, be interchangeable. Variac is a (typically single coiled) variable transformer, whereas rheostat is a variable resistor. Although they may look just the same, they differ in one aspect - wire resistance. It should be as low as possible for variac, but it can differ on rheostats. So-you can use wire rheostat as a low efficiency variac and you can use wire variac as ridiculously huge rheostat, resistive range of which serves no practical purpose.


A rheostat and a potentiometer are two different applications for the same device, a variable resistor. These devices have three terminals. Two terminals are connected across the complete resistor, while the third terminal is connected to a controllable wiper. The variable resistance is provided between the wiper terminal and either one of the other two terminals.When used to control current, it is called a rheostat. When used to control voltage, it is called a potentiometer.


To control the value of resistance in the circuit.e.g. In a simple circuit consisting of a cell/battery/power supply, a bulb and a rheostat, the more resistance you add with the rheostat gives a dimmer bulb, whereas you can decrease the resistance and resulting in a brighter bulb.Another AnswerVariable resistors have three connections: one at opposite ends, and the other connected the 'wiper'.Variable resistors can be used as rheostats or potentiometers. 'Rheostat' and 'potentiometer' are the names we give to how variable resistors are used; they are not the names given to the device itself.A rheostat is a variable resistor used to control current. To do this, it is connected in series with the load, and the connection is made between one of the outer terminals and the wiper terminal.A potentiometer is a variable resistor used to control voltage across a load. To do this, the supply voltage is connected between the two outer terminals, and the load is connected between one of the outer terminals and the wiper terminal.


Resistors are either fixed value, or variable. A variable resistor has three terminals; one at either end and one attached to a moving 'wiper', and can be connected either as a potentiometer or as a rheostat. So 'potentiometers' and a 'rheostats' are different applications for variable resistors. A potentiometer uses all three terminals, and is used to control levels of potential; whereas a rheostat uses just two of the three terminals, and is used to control current.


A potentiometer is a variable resistor, while a voltmeter is a device that measures voltage.


Resistors are ohmic and fixed whereas metrosils are non ohmic and variable - version of a varistor.


what is the difference between a variable and a control


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The difference between a Transistor and a Resistor is that a transistor is designed to amplify the electrical current, whereas a Resistor is designed to reduce the electrical current.


The difference between a controlled variable and a variable is in their state. A controlled variable is something which is rigid and constant while a variable is liable to change and inconsistent.


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The difference between these both is that the control is what stays the same in an experiment and the variable is what changes.


Difference between thick and thin film resistor is not related to thickness but its based on how the film is applied to the surface.


A Potentiometer, an adjustable resistor, is connected between the power source and the motor. An AC motor would use a Rheostat .


dpr8ea9 is a resistor plug dp8ean is non resistor.


http://www.coderanch.com/t/399872/java/java/Difference-instance-variable-reference-variable



The difference between fixed and variable mortgages are that in a fixed mortgage, the rate can not change. In a variable mortgage, the rate changes with time.


A non-ohmic resistor doesn't have a constant resistance. A ohmic resistor has a constant resistance.



When we want to regulate somthing ;we use variable resistors for example :volume control in radios and volume in headset. Also , the variable resistors can forms a potential devider in which the overall resistance between the two end points remain the same,but the ratio of the two resistors in the legs changes.so the variable resistor is affectively a potential divider. Also, the variable resistor can forms a potential divider in which the overall resistance between the two end points remains the same, but the ratio of the two resistors in the legs changes. So, the variable resistor is effectively a potential divider.


The difference between a variable and a control is that a variable can change during an experiment and a control cannot change.



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