What is the significance of rheostat?
Answers
Answer:
Explanation:rheostat is a variable resistor which is used to control current. They are able to vary the resistance in a circuit without interruption. The construction is very similar to the construction of a potentiometers. It uses only two connections, even when 3 terminals (as in a potentiometer) are present. The first connection is made to one end of the resistive element and the other connection to the wiper (sliding contact). In contrast to potentiometers, rheostats have to carry a significant current. Therefore they are mostly constructed as wire wound resistors. Resistive wire is wound around an insulating ceramic core and the wiper slides over the windings.
The electrical instrument Rheostat has the following significance:
- It is a resistor whose value can be varied to control the current.
- In a rheostat, the resistive wire is wound around an insulating ceramic core and the wiper can be adjusted by the slides over the windings.
- It is able to vary the resistance in a circuit without interruption.
- With the help of a rheostat, we can adjust the current according to the requirement.
- By using the rheostat, the need to replace the resistor again and again is eliminated.
- We can use a rheostat to control the speed of the motors or to dim lights.