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Isolator is a mechanical switch which isolates a part of circuit from system as when required. Electrical isolators separate a part of the system from rest for safe maintenance works. So definition of isolator can be rewritten as Isolator is a manually operated mechanical switch which separates a part of the electrical power. Isolators are used to open a circuit under no load. Its main purpose is to isolate one portion of the circuit from the other and is not intended to be opened while current is flowing in the line.
A rheostat is a resistor with variable resistance.There are many type of rheostat,involved of a rotary-type rheostat and a sliding rheostst.I dunn know much about the rotary-t â¦ ype rheostat but I can tell u how does a sliding rheostat work. The purpose of the rheostat is use to change the resistance of the circuit. The rheostat is use to define Ohm Laws th â¦ e 2nd situation is use to find out what the fixed resistor's resistance. 3rd purpose: used to control the resistance of circuit. eg Radio.