# Ideal Voltage/Current Source

#### Rukhairil Aizat

Joined Jan 14, 2015
1
Hi guys, i have a little bit confuse between ideal voltage source and ideal current source? have a nice day

#### ericgibbs

Joined Jan 29, 2010
17,131
hi,
Look at this PDF for an explanation.
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#### nDever

Joined Jan 13, 2011
153
Welcome,

What about ideal sources is giving you trouble?

Ideal voltage sources have no internal resistance, and if they are shorted, an infinite current is pulled. Of course, real voltage sources always have some amount of internal resistance; they pull a finite current if shorted (but you should never short any voltage source in practice). Ideal voltage sources also maintain a constant voltage no matter what is connected to them.

Ideal current sources maintain a constant current through them no matter what is connected to them.

Ideal sources are used in circuit design because they simplify circuit analysis. They are also useful because they can be used to model many components that would be difficult to analyze otherwise.

#### crutschow

Joined Mar 14, 2008
31,492
....................................(but you should never short any voltage source in practice). ..........................
Unless the voltage source is designed with a current-limit to tolerate a short, such as most bench power supplies.

#### WBahn

Joined Mar 31, 2012
28,156
Hi guys, i have a little bit confuse between ideal voltage source and ideal current source? have a nice day
The simplest way, IMO, to keep them straight is that an ideal voltage source will produce whatever current is needed, be it positive, negative, or zero, in order to maintain the specified voltage across its terminals. Similarly, an ideal current source will produce whatever voltage is needed, be it positive, negative, or zero, in order to maintain the specified current through its terminals.