Variable resistor, Physics

Assignment Help:

The variable resistor is a resistor whose value can be accustomed by turn a shaft or sliding a control. They are also referred to as potentiometers or rheostats and permit the resistance of the device to be altered by hand. A rheostat is a variable resistor with two terminals, one sliding and one fixed. It is utilized with high currents. The term rheostat is usually reversed for higher-powdered device, above about ½ watt. A potentiometer is a common type of variable resistor; one common use is as volume controls on audio amplifiers and other forms of amplifiers.

CLASSIFICATIONOF VARIABLE RESISTORS:

These resistors can be categorized on the basis of material used and application. On the basis of application they are known as the general purpose and they are of precision type. But on the basis of resistive material they are categorized as:

(a)          Carbon composition resistors

(b)         Wire wound resistors

(c)           Cermets resistors

(d)         Multi-turn resistors

(e)         Multi-turn potentiometers

 

 

 


Related Discussions:- Variable resistor

Semiconductor materials: gallium arsenide, Energy gap: 1.4ev at room temper...

Energy gap: 1.4ev at room temperature Its charactistics are very closely related to those of germanium. This is under stable, since Gallium is the third column neighbour and a

what percentage should the pressure of a given mass, By what percentage sh...

By what percentage should the pressure of a given mass of gas be increased,so as to decrease its volume  by 10% at a constant temperature.

Measurement of the thickness of a thin transparent mica slit, Q.   Describe...

Q.   Describe the method of measurement of the thickness of a thin transparent mica slit using Fresnel's Bi-prism. Give necessary theory. Draw suitable diagram. Measurement of

Define the nuclear power, Define the Nuclear Power As an energy source,...

Define the Nuclear Power As an energy source, nuclear power is an alternative to fossil fuels.  Controlled nuclear chain reactions are used to generate electricity in a safe ma

What is magnetic flux density?, It is defined as the magnetic lines of forc...

It is defined as the magnetic lines of force per unit area of the pole face.                                                    B=φ/A where φ is the magnetic lines of f

Evaluate the change in entropy, Two moles of an ideal gas expands reversibl...

Two moles of an ideal gas expands reversibly and isothermally to ten times its volume at 25°C. Evaluate the change in entropy during the process. ( R = 8.314 JK -1 mol -1 )

Quantum theory, a yellow lamp emits light with a wavelength of 6.00E-7 mete...

a yellow lamp emits light with a wavelength of 6.00E-7 meters. Calculate the frequency of the yellow light.

What are non-mechanical waves , The waves which do not needs medium for the...

The waves which do not needs medium for their propagation are known as non- mechanical or electromagnetic waves. Examples : Light, heat (Infrared), radio waves, gamma- rays, X-r

Friction, role of friction in snow?

role of friction in snow?

Explain average acceleration, AVERAGE ACCELERATION: The total change in...

AVERAGE ACCELERATION: The total change in velocity of a body separated by total time taken is known as average acceleration. It is denoted by a ? av   or  .

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd