EMF Full Form
What is the full form of EMF?
EMF stands for “Electromotive Force." In electromagnetism and electronics, the electrical activity produced by a non-electrical source, represented in volts, is referred to as electromotive force. Generators (sometimes referred to as transducers) create an EMF (which converts mechanical energy) or batteries, which convert chemical energy into electrical energy. Sometimes the analogy of hydraulic pressure is used to describe electromotive force. The electromotive force is defined as the work performed on a unit of electric charge or the energy acquired per unit of electric charge.
- What is the full form of EMF?
- What is “EMF”?
- Symbol of EMF
- The formula of electromotive force
- Unit of electromotive force
- What is the dimension of electromotive force?
What is “EMF”?
Electromotive force is frequently referred to by its abbreviation, EMF.
Energy is transformed from one form to another using a generator or a battery. One terminal in these devices charges up positively, whereas the other charges up negatively. Therefore, work performed on a unit of electric charge generates an electromotive force.
As its name implies, the electromotive force is not a force. It is measured in volts, which is equal to a metre-kilogram-second system for one joule per coulomb of electric charge. The statvolt, or one erg per electrostatic unit of charge, is the unit of electromotive force in the centimetre-gram-second system of electrostatic units.
Symbol of EMF
Electromotive force, or EMF, is denoted by the symbol “ε”.
The formula of electromotive force
The formula for electromotive force is:
\varepsilon=V+I \mathrm{r}
Where
‘ε’ denotes Electromotive Force
‘V’ denotes voltage of the cell
‘I’ denotes current across the circuit
‘r’ denotes internal resistance of the cell
Unit of electromotive force
The unit of electromotive force is the ‘volt.’
EMF is expressed as the number of joules of energy provided by the source, divided by each Coulomb, to permit a single electrical charge to move over the circuit.
\text { Volts }=\frac{\text { Joules }}{\text { Coulombs }}
What is the dimension of electromotive force?
EMF is expressed as the amount of work completed on a unit charge and is shown as follows:
E M F=\frac{\text { Joules }}{\text { Coulombs }}
Therefore, the dimension of electromotive force is M1L2T-3I-1.
Frequently Asked Questions (FAQs)
The term "terminal voltage" refers to the potential difference across the terminals of the load when the circuit is active. On the other hand, EMF is described as the highest potential difference that a battery can give when no current is flowing.
The SI unit of electromotive force is obtained as joules per coulomb, i.e., volts.
Yes, EMF can be negative.
For example, the inductor is producing an EMF that opposes the incoming power. Then, the generated EMF is considered negative as the flow goes in the opposite direction as the actual power. Therefore, EMF can be negative.
The device used to measure electromotive force is known as a potentiometer.