IIT JEE , AIEEE Forum - Physics , Electricity

hihoo

please provide a good theory on rheostat along with a good diagram.

actually i do not usually find it possible to solve jee oriented questions using the theory given in some good books

please use ur own language

do not please copy paste it from wikipedia or something like that ok

hihoo

replllllllly please

hihoo

diwali gaye .
now the duty of forum experts has increasth a lotbcoz jee has almost approached
please reply sirs.

hihoo

replllllllly please

nivedh_89

First of all, a rheostat is a resistor for regulating a current by means of variable resistances..............

nivedh_89

A rheostat is essentially a potentiometer, but is

usually much larger, designed to handle much higher

voltage and current. Typically these are constructed

as a resistive wire wrapped to form a toroid coil

with the wiper moving over the upper surface of the

toroid, sliding from one turn of the wire to the

next. Sometimes a rheostat is made from resistance

wire wound on a heat resisting cylinder with the

slider made from a number of metal fingers that

grip lightly onto a small portion of the turns of

resistance wire. The 'fingers' can be moved along

the coil of resistance wire by a sliding knob thus

changing the 'tapping' point. They are usually used

as variable resistors rather than variable potential

dividers.

nivedh_89

Rheostat.

krishna.gopal

Perfect answer nivedh. See the cylinder is like a conductor with a given specific resistance and by changing the distance between one of the end and the wiper you can change its resistance

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