What is reostat?

A reostat is an electrical device used to regulate the flow of current in a circuit by varying its resistance. It is usually a variable resistor that can be adjusted to change the current in a circuit. Reostats are commonly used in electronic circuits, motors, and other electrical systems to control the flow of electric current. They are mostly made from materials such as carbon, wire, and ceramics. Reostats are used to dim the brightness of lights, adjust the speed of electric motors, and control the temperature of heaters. They come in different types and sizes, and their resistance can be varied either manually using a knob or automatically using a control system. Reostats are handy electrical devices with many practical applications in daily life.