To know the difference between emf and voltage, we should be aware that emf stands for electromotive force and is referred to as the voltage present at the ends of the source in the absence of current. And when we close the circuit to let the electric current flow, then there is a presence of voltage at the ends of the source.
Difference Between EMF and Voltage
The voltage found is very small compared to emf and is the result of the source’s internal resistance leading to the drop in the voltage.
EMF is caused by electrically charged particles as a result of the separation of electrons from the atoms by consuming some types of energy such as chemical, mechanical, or light.
EMF= A/Q (where A= amount of work performed and Q= amount of electricity)
Voltage is the difference between the electrical states on the poles. In a closed electrical circuit, electrons move from the negative half to the positive half. Electrical voltage is defined as the work performed by the electric force in moving the charge from one point of the field to another
| Difference Between EMF and Voltage | |
|---|---|
| EMF | Voltage |
| It denotes the voltage produced inside the electric source. | It is the difference potential difference between two points |
| External forces work in moving a charge from one pole to another pole inside a source | It is the work in moving a charge from one pole to another through a wire |
| E = I * (R + r) | V = I * R |
| It follows the coulomb force operation | It follows a non-coulomb force operation |
| It measured with EMF meter | It is measured with a voltmeter |
| It is always greater than the voltage | It is always lesser than EMF |
| Its intensity is constant | Its intensity is not constant |
| EMF is caused in a gravitational, electric or magnetic field | Voltage is caused only in the electric field |
These were some difference between EMF and Voltage. If you wish to find out more, download BYJU’S The Learning App.
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| EMF:Cells, Electromotive Force and Internal Resistance | Motional emf, Electromotive force, Induced emf |
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