Question

Explain about the Electro motive Force and Terminal Voltage in detail (10th ICSE)

Answer 1

Electromotive force, abbreviated emf (denoted and measured in volts), is the electrical intensity or "pressure" developed by a source of electrical energy such as a battery or generator. ... This potential difference can drive an electric current if an external circuit is attached to the terminals.



The internal resistance r of a voltage source affects the output voltage when a current flows. The voltage output of a device is called its terminal voltage V and is given by V = emf − Ir, where I is the electric current and is positive when flowing away from the positive terminal of the voltage source.



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Answer 2

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ELECTROMOTIVE FORCE

It is defined as the electrical intensity developed across the ends of a linear or complex circuit by any source of electricity like Battery or Generator.

It is abbreviated as emf. It is denoted by the symbol ε and is measured in Volts (V).

It is the potential difference across the ends of a conductor when no current is flowing through it.

A device that converts other forms of energy into electrical energy such as a transducer provides an emf at its output.

In EMI (Electromagnetic Induction), emf can be defined around a closed loop of conductor as the electromagnetic work that would be done on an electric charge if it travels once around the loop.

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TERMINAL VOLTAGE

It is the voltage that is built across the Terminals of any electricity generating device like Cell, Battery, Generator etc.

It can be measured across the ends of a voltage source.

Sometimes, it is also known as the end life voltage as it is measured when the voltage source is about to get discharged.
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