What is EMF Electromotive Force?
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LearningTranscript
00:00What is electromotive force?
00:02We know that electric current is generated by the directional movement of electric charge.
00:07The direction of electric current is opposite to the direction of movement of negative charge,
00:12that is, the direction of movement of positive charge.
00:15It flows from the positive electrode to the negative electrode outside the power supply
00:21and from the negative electrode to the positive electrode inside the power supply.
00:26The magnitude of the electromotive force of the power supply is equal to the work done by the electric force
00:32to move the unit positive charge from the negative electrode to the positive electrode.
00:37For example, the potential of the positive charge in the figure increases from 0 volts to 20 volts,
00:44and the electromotive force is equal to 20 volts.
00:47Electromotive force generates voltage at both ends of the power supply.
00:51However, due to the existence of resistance inside the power supply,
00:55it will generate internal voltage.
00:58Therefore, the voltage at both ends of the power supply is generally smaller than the electromotive force of the power supply.
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