EMF Vs Voltage

Both voltage and EMF describe the electrical potential difference but are different terms. The terms voltage has a common use and it is same as the electrical potential difference. But EMF is a specific term and also used to describe a voltage generated by a battery.

The voltage found is very small compared to EMF and it is a result of the internal resistance of the source itself which is leading the drop in the voltage.

If you want to learn some different you are the right place for reading so keep reading for a few minutes for the right information regarding voltage and EMF.

Definition of EMF and voltage:

EMF: The amount of energy supply by the source to each coulomb of charge.
Voltage: Energy use by a unit charge to move from one point to another.

Difference between EMF and voltage are given below.
  • The EMF is represented by E where the voltage is represented is V.
  • EMF is the voltage generated by a source like a battery or a generator.
  • EMF(E) = I(R+r), Voltage (V) = IR.
  • EMF is generated by the electrochemical cell, photodiodes, photodiodes, etc while the voltage is caused by the electric and magnetic field.
  • The EMF is the measure of energy supply to each coulomb of charge whereas the voltage is the energy use by one coulomb of charge to move from one point to another.
  • EMF is a measure between the endpoint of the source when no current flows through it while the voltage measured between any two points.
  • The EMF is measured between the endpoint of the source, when no current flow through it, whereas the voltage is measured between any two points of the closed circuit.
  • Voltages in a circuit voltage drop are in the possible direction of EMF and their sum is equal to EMF according to Kirchhoff's law.
  • EMF is measured by EMF meter while voltage is measured by a voltmeter.
  • EMF has constant intensity with greater magnitude while voltage is non-constant intensity lower than EMF.

The EMF force of the source is equal to the work that some external source has to do to move the charging unit from one pole of the source to another but through the source. Voltage in the outer part of the circuitry is much equal to the work that needs be done by the electric force to move the charging unit from one pole of the source to the other but through the wire.

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