short note:Electromotive force
Answers
Answer:
Electromotive force is used in the electromagnetic flowmeter which is an application of Faraday's law.
Electromotive force is defined as the electric potential produced by either electrochemical cell or by changing the magnetic field.
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Answer:
Electromotive force (EMF) is equal to the terminal potential difference when no current flows. EMF and terminal potential difference (V) are both measured in volts, however they are not the same thing. EMF (ϵ) is the amount of energy (E) provided by the battery to each coulomb of charge (Q) passing through.
The EMF can be written in terms of the internal resistance of the battery (r) where: ϵ = I(r+R)
Which from Ohm’s law, we can then rearrange this in terms of the terminal resistance: ϵ = V+Ir
The EMF of the cell can be determined by measuring the voltage across the cell using a voltmeter and the current in the circuit using an ammeter for various resistances.