Does an AC circuit need a voltage source or a current source?

[Jhenrique]

When a circuit is being alimented by AC this means that exist in the circuit a voltage source that is generating the AC or exist a current source that is generating the AC?

 

[UltrafastPED]

Either will do the job.

 

[Jhenrique]

A voltage source that produces AC is = a current source that produces AC ?

 

[UltrafastPED]

Voltage source plus resistor in series is a current source; current source with a resistance in parallel is a votage source. They can be transformed freely, and thus either can be an AC source.

 

[Jhenrique]

but this guy:
http://upload.wikimedia.org/wikipedia/commons/6/6d/TE_Compon_07.svg
represents a current source or a voltage source?

 

[UltrafastPED]

That symbol is an AC voltage source ... the same circle as for a DC voltage, but since the +/- changes with time the squiggle represents the sine wave.

Current source symbols usually have an arrow.

What textbook are you studying from? It should have a table of symbols.

 

[Jhenrique]

That symbol is an AC voltage source ... the same circle as for a DC voltage, but since the +/- changes with time the squiggle represents the sine wave.

Current source symbols usually have an arrow.

What textbook are you studying from? It should have a table of symbols.

Actually, none (for the time being). But, for show you that I'm not a lazy, look my collection of math and mechanics in anex.