Electromotive force: Difference between revisions
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[[File:batterydura.jpg|200px|thumb|Figure 1. Batteries are a source of EMF, providing potential energy for electricity from their chemical energy.<ref>Wikimedia Commons [Online], Available: http://upload.wikimedia.org/wikipedia/commons/8/8d/Duracell_9_Volt_0849.jpg</ref>]] | [[File:batterydura.jpg|200px|thumb|Figure 1. Batteries are a source of EMF, providing potential energy for electricity from their chemical energy.<ref>Wikimedia Commons [Online], Available: http://upload.wikimedia.org/wikipedia/commons/8/8d/Duracell_9_Volt_0849.jpg</ref>]] | ||
<onlyinclude>'''Electromotive force''' ('''EMF''') is a [[voltage]] developed by any source of [[electrical energy]] such as a [[battery]] or [[photovoltaic cell]].</onlyinclude> The word "force" is somewhat misleading, because EMF is not a force, but rather a "potential" to provide [[energy]]. The term EMF is retained because of historical reasons, and is useful to distinguish between voltages that are generated and energy that is lost to [[resistor]]s.<ref>Hyperphysics, ''Electric voltage'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elevol.html</ref> | <onlyinclude>'''Electromotive force''' ('''EMF''') is a [[voltage]] developed by any source of [[electrical energy]] such as a [[battery]] or [[photovoltaic cell]].</onlyinclude> The word "force" is somewhat misleading, because EMF is not a force, but rather a "potential" to provide [[energy]]. The term EMF is retained because of historical reasons, and is useful to distinguish between voltages that are generated and energy that is lost to [[resistor]]s.<ref>Hyperphysics, ''Electric voltage'' [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elevol.html</ref> | ||
When a charged particle is present in the EMF, the voltage | When a charged particle is present in the EMF, the voltage creates an electric field which pushes that charge through an [[electric circuit]]. This energy can then be lost as [[heat]] throughout the circuit as the moving [[current]] of charges meets electrical resistance. The amount of resistance throughout the circuit dictates how much current will flow in it, given by [[Ohm's law]]. | ||
Visit [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elevol.html#c2 Hyperphysics] to learn more about electromotive force. | Visit [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elevol.html#c2 Hyperphysics] to learn more about electromotive force. | ||
Latest revision as of 20:43, 4 August 2026
Electromotive force (EMF) is a voltage developed by any source of electrical energy such as a battery or photovoltaic cell. The word "force" is somewhat misleading, because EMF is not a force, but rather a "potential" to provide energy. The term EMF is retained because of historical reasons, and is useful to distinguish between voltages that are generated and energy that is lost to resistors.[2]
When a charged particle is present in the EMF, the voltage creates an electric field which pushes that charge through an electric circuit. This energy can then be lost as heat throughout the circuit as the moving current of charges meets electrical resistance. The amount of resistance throughout the circuit dictates how much current will flow in it, given by Ohm's law.
Visit Hyperphysics to learn more about electromotive force.
For Further Reading
For further information please see the related pages below:
- Direct current
- Electric generator
- Battery
- Fuel cell
- Or explore a random page!
References
- ↑ Wikimedia Commons [Online], Available: http://upload.wikimedia.org/wikipedia/commons/8/8d/Duracell_9_Volt_0849.jpg
- ↑ Hyperphysics, Electric voltage [Online], Available: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elevol.html
