give the difference between fixed and variable resistance....     3 marks

Asked by Intekhab Akram | 14th May, 2014, 11:08: AM

Expert Answer:

A resistor is any object which opposes flow of electrons (i.e. electric current) through it.
A rheostat is an electronic device which is used for varying current in the circuit by changing the value of resistance.
Hence a rheostat is a variable resistor, whose resistance value can be changed as per our need while a resistor
has fixed value of resistance which cannot be altrered.
for example, If we have a rheostat of Syntax error from line 1 column 49 to line 1 column 73. Unexpected '<mstyle '. .
Here, the Rheostat can be adjusted to get all the resistances within it's upper limit.
Therefore rheostat can have resistance between 0 to 200 capital omega , while the resistor will have fixed resistance of 200 capital omega .

Answered by Ravindra Kapal | 15th May, 2014, 03:04: PM