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Electromotive force - Electromotive Force: Definition, Formula & Potential Difference


What Is Electromotive Force? (with picture)


The terminal voltage is equal to , which is equal to the potential drop across the load resistor.



Introduction to Electromotive Force Voltage has many sources, a few of which are shown in.





It requires a closed circuit to proceed, since the two electrons must be supplied to the cathode.



As with potential energy, it is the change in voltage that is important.



The terminal voltage here is only slightly lower than the emf, implying that the current drawn by this light load is not significant.

As you disconnect the source of the voltage from the lamp, the net flow of charges within the emf source becomes zero.


Electromagnetic induction



Electromotive Force: Definition, Formula, Derivation of the Formula


The voltage output of each device depends on its construction and load.




10.2: Electromotive Force


The lead acid battery used in cars and other vehicles is one of the most common combinations of chemicals.








Description: The lead acid battery used in cars and other vehicles is one of the most common combinations of chemicals.

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Note also that since the chemical reactions involve substances with resistance, it is not possible to create the emf without an internal resistance.

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Latest Comments

    +288reps
    What is Electromotive Force? Electromotive force is defined as the electric potential produced by either electrochemical cell or by changing the magnetic field. EMF is the commonly used acronym for electromotive force. A generator or a battery is used for the conversion of energy from one form to another.
    By: Aqua-Skye|||https://www.facebook.com/people/Aqua-Skye/635781638|||https://twitter.com/weloveaquaskye|||https://www.youtube.com/watch?v=n9KjA471Y3k
    +211reps
    Electromotive force i.e EMF is an unfamiliar concept to most of the students. Understanding the difference between these two and what EMF means gives us the tools we need to solve many problems in physics as well as in electronics. This topic will explain the emf formula with examples.
    By: asiasart|||https://www.facebook.com/ValentinaxGigante/|||https://twitter.com/AsiaSart|||https://www.reddit.com/user/asiasart/
    +21reps
    4. Motional Electromotive Force F qv B = Γ— - A charged particle in rod experiences a magnetic force that causes free charges in rod to move, creating excess charges at opposite ends. - The excess charges generate an electric field (from a to b) and electric force (F = q E) opposite to magnetic force.
    By: bluelizardK|||https://www.facebook.com/MimeticPhantasmProductions/|||https://twitter.com/BluelizardK|||https://www.youtube.com/watch?v=62H_LATSYLw
    +140reps
    This extra part of the force is called the magnetic force, and is described by magnetic fields. For slow movement, the magnetic force is minimal and Coulomb's law can still be considered approximately correct, but when the charges are moving more quickly in relation to each other, the full electrodynamics rules (incorporating the magnetic force.
    By: FilmUpdates|||https://www.facebook.com/FilmUpdatestGuru/|||https://twitter.com/filmupdates|||https://www.youtube.com/channel/UCgvSRdfp8JlRHlunN5gY4EQ
    +178reps
    4. Motional Electromotive Force F qv B = Γ— - A charged particle in rod experiences a magnetic force that causes free charges in rod to move, creating excess charges at opposite ends. - The excess charges generate an electric field (from a to b) and electric force (F = q E) opposite to magnetic force.
    By: drake_nguyen|||https://www.facebook.com/nguyen.drake|||https://twitter.com/TBNR_Drake|||https://www.youtube.com/user/trungoke129
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