Difference between revisions of "Dynamo"
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The full name ''dynamo-electric machine'' was given by Siemens in 1867, to distinguish his [[invention]] from the magneto-electric [[machines]] previously used, in which the [[electric]] current was [[generated]] by means of a [[permanent]] [[magnet]]. But in the shortened [[form]] dynamo (recommended by Prof. S. P. Thompson early in 1882), the use of the [[word]] has been extended so as to include all [[forms]] of these [[machines]]: | The full name ''dynamo-electric machine'' was given by Siemens in 1867, to distinguish his [[invention]] from the magneto-electric [[machines]] previously used, in which the [[electric]] current was [[generated]] by means of a [[permanent]] [[magnet]]. But in the shortened [[form]] dynamo (recommended by Prof. S. P. Thompson early in 1882), the use of the [[word]] has been extended so as to include all [[forms]] of these [[machines]]: | ||
| − | *Date: [ | + | *Date: [https://www.wikipedia.org/wiki/19th_Century 1882] |
==Definitions== | ==Definitions== | ||
*1 : [[generator]] | *1 : [[generator]] | ||
*2 : a [[force]]ful energetic [[individual]] | *2 : a [[force]]ful energetic [[individual]] | ||
==Description== | ==Description== | ||
| − | A '''dynamo''', [[originally]] another [[name]] for an [[electrical]] [[generator]], now means a generator that produces [ | + | A '''dynamo''', [[originally]] another [[name]] for an [[electrical]] [[generator]], now means a generator that produces [https://en.wikipedia.org/wiki/Direct_current direct current] with the use of a [https://en.wikipedia.org/wiki/Commutator_(electric) commutator]. Dynamos were the first [[electrical]] [[generators]] capable of delivering [[power]] for industry, and the [[foundation]] upon which many other later electric-[[power]] conversion devices were based, including the [https://en.wikipedia.org/wiki/Electric_motor electric motor], the alternating-current [https://en.wikipedia.org/wiki/Alternator alternator], and the [https://en.wikipedia.org/wiki/Rotary_converter rotary converter]. They are rarely used for [[power]] [[generation]] now because of the [[dominance]] of alternating current, the disadvantages of the commutator, and the ease of [[converting]] alternating to direct current using [https://en.wikipedia.org/wiki/Solid_state_(electronics) solid state] [[methods]]. |
| − | The [[word]] still has some regional usage as a replacement for the word [[generator]]. A small electrical generator built into the hub of a bicycle wheel to [[power]] [[light]]s is called a [ | + | The [[word]] still has some regional usage as a replacement for the word [[generator]]. A small electrical generator built into the hub of a bicycle wheel to [[power]] [[light]]s is called a [https://en.wikipedia.org/wiki/Hub_dynamo Hub dynamo], although these are invariably AC devices. |
[[Category: Physics]] | [[Category: Physics]] | ||
Latest revision as of 01:17, 13 December 2020
Etymology
short for dynamoelectric machine. A machine for converting energy in the form of mechanical power into energy in the form of electric currents, by the operation of setting conductors (usually in the form of coils of copper wire) to rotate in a magnetic field.
The full name dynamo-electric machine was given by Siemens in 1867, to distinguish his invention from the magneto-electric machines previously used, in which the electric current was generated by means of a permanent magnet. But in the shortened form dynamo (recommended by Prof. S. P. Thompson early in 1882), the use of the word has been extended so as to include all forms of these machines:
- Date: 1882
Definitions
- 1 : generator
- 2 : a forceful energetic individual
Description
A dynamo, originally another name for an electrical generator, now means a generator that produces direct current with the use of a commutator. Dynamos were the first electrical generators capable of delivering power for industry, and the foundation upon which many other later electric-power conversion devices were based, including the electric motor, the alternating-current alternator, and the rotary converter. They are rarely used for power generation now because of the dominance of alternating current, the disadvantages of the commutator, and the ease of converting alternating to direct current using solid state methods.
The word still has some regional usage as a replacement for the word generator. A small electrical generator built into the hub of a bicycle wheel to power lights is called a Hub dynamo, although these are invariably AC devices.
