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The full form of EMF is Electromotive Force. An electrochemical cell or a change in the magnetic field produces an electric potential, defined as an electromagnetic 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 in 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.
Also Read: How to Become an Electrical Engineer?
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
Also Read: Electrical Engineering Courses
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 gravitational fields are caused by EMF
- E is used to represent the electromotive force
FAQS
1. What does EMF stand for?
- EMF stands for Electromotive Force.
2. What is the formula and unit of EMF?
- Formula: ( E = V + Ir )
- Unit: Volts (( V ))
3. What are the characteristics of EMF?
- EMF is defined as the work done on a unit charge.
- It is independent of circuit resistance and remains constant.
- EMF creates electric, magnetic, and gravitational fields.
Also Read: All About Faraday’s Law
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