Explain the phenomenon of electromotive force
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Emf or electromotive force of an electrical device such as a battery is the potential difference between its two terminals. Emf is the electrical energy consumed or delivered to the circuit when a unit amount of charge (coulomb) flows out of the device.
In a battery there is chemical energy stored in the electrolyte between electrodes in terms of charges being held at the anode and cathode. There is an electric field in action between the two terminals, which acts on the (electrons) charges and so they flow (due to the force on the charges due to the field) through the conductor connecting the two terminals.
emf is actually measured in volts (potential difference) that drives flow of current. When the current flows the stored energy in the battery is released steadily.
In a battery there is chemical energy stored in the electrolyte between electrodes in terms of charges being held at the anode and cathode. There is an electric field in action between the two terminals, which acts on the (electrons) charges and so they flow (due to the force on the charges due to the field) through the conductor connecting the two terminals.
emf is actually measured in volts (potential difference) that drives flow of current. When the current flows the stored energy in the battery is released steadily.
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