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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.

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โˆ™ 2012-12-23 15:41:56
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Q: What is the difference between a variac and a rheostat?
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Related questions

Difference between variable resistor and rheostat?

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


What is the difference between a potentiometer and a rheostat?

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.


What kind of a device is a variac?

A variac is a transformer device that controls the output of AC line voltage to an electrical or electronic device. The variac is available in different sizes to suit ones needs.


What is J4 variac?

A J4 variac is an electronics term. This term refers to the variable amount of wattage in the electric field.


How do you Test a rheostat?

how to test a rheostat?


What is j4 variac in electricals?

In the electronics field, a J4 variac is a type of electric energy transfer. It involves the variance of the electric energy.


What re the difference between slide-wire rheostat carbon rheostat and resistance box.?

Slide wire rheostat: We can get continuous variation in resistance. It is used in such situations where we are supposed to get a fixed current flowing throug the circuit-some integral value like 1,2 etc instead of 1.343 and all. Resistance box: It is a deveice used to get a specific value of resistance. We may not get a simple value for current.


What does ac stand for in ac variac?

alter. curent


What does a rheostat control?

A rheostat is a variable resistor and these control the flow of current.


What is the difference between resistance box and rheostat?

Resistance box will provide resistance of discrete values such as 1, 2, 3 ohms or 0.1,0.2, 0.3 ohms. So interim values are not possible. But rheostat gives a chance to vary the resistance continuously. It may be 5 ohm or even 5.769 ohm. So just to fix current for a specified value such 1.5 ampere resistance box will not be suitable where as a rheostat is the most suitable.


Where does lost energy in a rheostat go?

It is lost in heating the resistive material of the rheostat.


What is rheostat-?

A rheostat is an electrical instrument. It is used to control a current by varying the resistance.

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