Full form of EMF: The electromotive force is the potential difference created when an electrical current flows through a conductor. It is measured in volts.
The electromotive force (EMF) of an electrical system is defined as the difference between the potentials at the two ends of a conductor or circuit. The EMF is related to power dissipation, voltage and current by the equation:
The magnitude of the EMF depends on the size of the circuit and its resistance. The relationship between current, voltage and power is given by Ohm’s law:
In addition to power dissipation, voltage and current, the EMF can also be caused by other factors such as capacitance and inductance.
The EMF can be calculated by knowing what each of these factors are for a simple circuit with only one wire. For example, if there is a battery connected to a resistor, then we know that voltage will be present across both points and that there will be power dissipated in this circuit. Similarly, if there is a light bulb connected to an AC current source, then we know that there will be voltage present at both ends and therefore power will be dissipated in this AC circuit. However, if there is no battery installed or if no light bulb is present, then we do not know what type of circuit exists so we cannot calculate EMF in this situation.
Electromotive force is determined by two factors:
1) how much charge is produced when electricity enters a conductor and
2) how much resistance there is to this charge being able to leave the conductor. The amount of charge that can be transferred through a conductor depends on how much voltage one can use to create this charge. When one applies more voltage, more charge can be produced, and thus more electromotive force will be generated. Similarly, if a person reduces the resistance of the conductor, then less electromotive force will be generated. Electromotive force is directly proportional to voltage and inversely proportional to resistance.
Answer by another Teacher:
Full form : Electromotive Force
What is EMF :
It is a measure of the energy that drives an electric current through a circuit. It is measured in volts (V).
Working: EMF is created by a generator or battery when there is a difference in electrical charge between two points in a circuit. The measure of EMF depends on the strength of the magnetic field that is induced by the electric current passing through the circuit.
Types:
EMF can be classified into two types- AC (Alternating Current) and DC (Direct Current). AC EMF is used for power transmission and distribution, while DC EMF is used for electroplating, metal refining, and other electrochemical processes.
Applications:
EMF is used in various applications such as generators, batteries, and electrical circuit
Benefits:
EMF is crucial for various electrical and electronic devices, making them operational. It helps in the efficient functioning of electrical equipment by providing the necessary energy to work.
Disadvantages:
High levels of EMF can be harmful to human health, causing various issues such as headaches, fatigue, and stress. It can also interfere with electronic devices, causing them to malfunction. The production and distribution of high levels of EMF can also lead to environmental pollution.
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