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Consider the following statements regarding electromechanical devices: 1. A potentiometer has an input of rotation and an output of a potential difference. 2. An electric motor has an input of a potential difference and an output of rotation of a shaft. 3. A generator has an input of rotation of a shaft and an output of a potential difference Which of the above statements are correct?

Consider the following statements regarding electromechanical devices: 1. A potentiometer has an input of rotation and an output of a potential difference. 2. An electric motor has an input of a potential difference and an output of rotation of a shaft. 3. A generator has an input of rotation of a shaft and an output of a potential difference Which of the above statements are correct? Correct Answer 1, 2 and 3

Concept:

Electromechanical devices are the devices in which they have both electrical and mechanical processes. For example, a manually operated switch is an electromechanical component as it gives the mechanical movement causing an electrical output.

Electromechanical devices, such as potentiometers, motors and generators, transform electrical signals to rotational motion or vice versa.

Potentiometer: A potentiometer is an instrument designed to measure an unknown voltage by comparing it with the known voltage. The known voltage may be supplied by a standard cell or any other known voltage reference source.

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A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.

A potentiometer has an input of displacement either linear or angular and gives an output of potential difference.

Electric Motor: An electric motor is an electrical machine that converts electrical energy into mechanical energy. It works on the principle of electromagnetic induction, i.e. when a voltage is induced by a changing magnetic field that would make the copper coil inside the motor turn around repeatedly inside its permanent magnet.

For an electric motor, the input is potential difference, and output is the rotation of the shaft.

Generator: An electrical generator is a machine that converts mechanical energy into electrical energy. It is based on the principle of the production of dynamically induced emf. According to Faraday's Laws of Electromagnetic Induction, whenever a conductor cuts magnetic flux, dynamically induced emf is produced in it. This emf causes a current to flow in the conductor if the circuit is closed.

For electric generators, the input is the rotation of a shaft, and output is a potential difference.

Hence from the above explanation, we can see that all the three statements are correct.

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