Difference between revisions of "Voltage"

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(New page: '''Voltage''' is defined as the electric potential between two points. In practical terms, the higher the voltage of a battery, the more power it can supply. You can just barely taste the ...)
 
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'''Voltage''' is defined as the electric potential between two points. In practical terms, the higher the voltage of a battery, the more power it can supply. You can just barely taste the voltage of a 1.5V battery, but a 9V batter will give your tongue a shock if you try that. Model car sets run on 18V, and voltage over 60V can give you a lethal shock.
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'''Voltage''' is defined as the ''electrical potential'' between two points, that is, the [[potential energy]] difference between two points due to [[electrical charge]]<ref name="Schwarz">Schwarz, Stephen E. and William G. Oldham. ''Electrical Engineering: An Introduction, 2e.'' Oxford University Press: 1993.</ref> Its unit is the [[volt]].
  
In [[alternating current]], the potential for shock is less, but 115V (AC) can still give you quite a jolt. It is used to power most household appliances in the U.S.
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An important point to note is that only the ''difference'' in potential has any practical meaning, not the absolute value. As such, a ''ground'' can be defined in a circuit, which has a potential of 0 volts.
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==See Also==
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*[[Kirchoff's voltage law]]
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*[[Electrical power]]
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*[[Conductance]]
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*[[Resistance]]
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*[[Current]]
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[[Category:Electrical Engineering]]

Revision as of 03:51, October 9, 2007

Voltage is defined as the electrical potential between two points, that is, the potential energy difference between two points due to electrical charge[1] Its unit is the volt.

An important point to note is that only the difference in potential has any practical meaning, not the absolute value. As such, a ground can be defined in a circuit, which has a potential of 0 volts.

See Also

  • Schwarz, Stephen E. and William G. Oldham. Electrical Engineering: An Introduction, 2e. Oxford University Press: 1993.