What is electromotive force? What is induced electromotive force?

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8/6/20232 min read

Electromotive force (emf) refers to the potential difference (voltage) provided by a power source in a circuit, which enables the flow of electric charges. It represents the ability of the power source to provide energy to the charges.

Electromotive force can be understood as the conversion of energy between the internal and external parts of the power source. When a power source is connected to a circuit, it exerts an electric field force to propel charges to move along the circuit. Electromotive force is the ratio of the strength of the internal electric field of the power source to the work done by the charges in the external circuit. It is usually measured in volts.

Induced electromotive force, on the other hand, refers to the electromotive force generated in a closed circuit due to changes in the magnetic field. According to Faraday’s law of electromagnetic induction, when a closed coil or conductor loop encounters a change in the magnetic field, an induced current is generated in the circuit, accompanied by the generation of induced electromotive force. The magnitude of this electromotive force depends on the rate of change of the magnetic field and the characteristics of the coil or conductor loop.

Induced electromotive force can be realized through two ways. The first way is when changes in the magnetic field lead to changes in the magnetic flux within the conductor, such as changes in the magnetic field strength, direction, or the position of the conductor. In this case, free electrons in the conductor are induced, resulting in induced current and the generation of induced electromotive force. The second way is when a conductor moves through a magnetic field, the relative motion between the conductor and the magnetic field also leads to the generation of induced electromotive force. In this case, free electrons in the conductor experience the force from the magnetic field, producing induced current and induced electromotive force.

Induced electromotive force has wide applications in various devices and technologies. For example, transformers utilize induced electromotive force to achieve voltage transformation, where an alternating magnetic field induces electromotive force in the secondary coil, enabling the transmission and transformation of electrical energy. Induced electromotive force is also used in generators, induction heating, and other technologies.

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