The EMF full form is Electromotive Force. An electrochemical cell or a change in the magnetic field produces an electric potential defined as Electromotive Force. We generally use a generator or a battery to convert energy from one form to another. There is one positively charged terminal and a negatively charged terminal inc such electrical devices. Electromotive force is also defined as work done on a unit of electric charge. It is commonly used in electromagnetic flowmeters which is an application of Faraday’s Law.
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What are the Formula and Unit of EMF?
The formula for the Electromotive Force is as follows:
E = V + Ir
In the formula,
- V is the voltage of the cell
- I is the current present throughout the circuit
- r is the internal resistance of the cell
- And E is the Electromotive force
Numerically, EMF is described as the number of Joules of energy supplied through the source upon each Coulomb to enable a unit electric charge to move across the circuit.
Volts = joules/coulombs
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What are the Characteristics of EMF?
The following are the characteristics of EMF:
- EMF is defined as the work done on a unit charge
- Electromotive force is independent of circuit resistance
- It remains constant
- Electric, magnetic and the gravitational field are caused due to EMF
- E is used to represent the electromotive force
Also Read: All About Faraday’s Law
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