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Rotary Potentiometers, Rheostats are electronic devices used to measure the amount of energy stored in circuits. They are primarily used to measure the amount of electricity, or current, flowing in an electrical circuit. The basic principle behind rotary potentiometers, rheostats is to measure the resistance of an electrical component or circuit. The resistance is measured by sending an alternating current, or AC, through the circuit and measuring how much voltage drops in the circuit. In other words, the device measures the amount of power that is used to keep an electrical circuit in operation.

Resistive elements are used in the rotary potentiometers and rheostats. Generally, when current moves through a resistive element, its resistance will increase. Therefore, the basic operation of the rotary potentiometers and rheostats is to measure and adjust the resistance of an electrical circuit. When an electrical circuit is opened, its resistance will increase. When an electrical circuit is closed, its resistance will decrease.

The rotary potentiometers and rheostats consist of a three-wire set: two of the wires are attached to the resistive element in order to measure the current or voltage, and the third wire is connected to an adjustable knob. When the knob is turned, the resistive element changes its value, which in turn results in a change in the current and/or voltage. Thus, the rheostat can be used to adjust the resistance of a circuit.

The rotary potentiometers and rheostats can be used for various applications such as circuit protection, voltage regulation, current control, and many other applications. In circuit protection, the rheostat is used to adjust the voltage in order to protect the circuit components from being overloaded. In voltage regulation, the rheostat is also used to adjust the voltage of the circuit to the desired level. In current control, the rheostat is used to adjust the current in the circuit so that it does not cause damage to the components. Additionally, it can be used to adjust the power in a circuit.

In conclusion, rotary potentiometers and rheostats can be used in various applications and are very useful in circuit management and control. They are versatile and highly reliable. The adjustable knob of the rheostat allows the user to adjust the resistance of the circuit according to the requirement. Therefore, it is an important electronic device used in many applications.

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