explain EMF of physics 12th
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Heya mate...
☢️Electromotive force, abbreviated emf, is the electrical action produced by a non-electrical source. A device that converts other forms of energy into electrical energy, such as a battery or generator, provides an emf as its output. Sometimes an analogy to water "pressure" is used to describe electromotive force...
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Explanation:
Emf(electromotive force) of the cell drives the current carriers to move in a specific direction.
This Emf causes positive and negative charges to flow in a specific direction. As a result current is generated.
Emf is a misnomer.
This means from the name it suggests it is a force but actually it is not.It is the potential difference between the two electrodes.
It is known as force because it acts as initial force to start the flow of charge.
Emf is defined as maximum work done per unit charge to take charge from one point to another.
It can be also defined as maximum potential difference between (+ive) and (-ive) electrodes of the cell in an open circuit.
Emf provides an energy which does the work to move the charge from one point to another.
As there is potential difference between the two electrodes the charges will flow.
The charges will tend to flow from higher potential to lower potential.
There is no conductive path between the electrodes, so charges can’t flow from inside the electrodes.
That is why a path is created by the circuit by the conducting wires.
The electrons start flowing towards the (+)ive terminal and as a resultelectric current is generated.
Similarly (+) ive charges will flow towards the (-)ive terminal of the cell.
Main reason for the flow of charge is the difference in the potential between the electrodes of the cell.
This difference in the potential between the electrodes of the cell is known as Emf.
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