give the difference between fixed and variable resistance.... 3 marks
Asked by Intekhab Akram | 14th May, 2014, 11:08: AM
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 .
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 , while the resistor will have fixed resistance of 200 .
Answered by Ravindra Kapal | 15th May, 2014, 03:04: PM
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