Voltage
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EMF
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It is the difference potential difference between two points
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It denotes the voltage produced inside the electric source.
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V = IR
Where
V = Voltage in Volts
I = Current in Amperes
R = Resistance in Ohms
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E = I(R + r)
E = W/Q
Where:
E or ε = EMF in Volts
W = Work done energy in Joules
Q = Charge in Coulombs
r = Internal resistance of the battery cell in ohms
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Measure between any two points.
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Measure between the end point of the source, when no current flows through it.
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Voltage follows a non-coulomb force operation.
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Electromotive force follows the coulomb force operation.
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It is measured with a voltmeter
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It measured with EMF meter
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Its intensity is not constant
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Its intensity is constant
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Work performed in moving a charge from one point to another through a conductor wire.
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In a source, external forces work performed in moving a charge from one point to another.
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Voltage depends on the circuit resistance
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EMF doesn’t depends on the circuit resistance.
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Electric and magnetic field
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Dynamo, electrochemical cell, transformer, solar cell, photodiodes etc.
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Voltage is denoted by the letter V.
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Electromotive force is denoted by ℰ.
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