We'd like to use analytics cookies to understand which symbols people look up, so we know what to research next. They are not used for advertising and we set none of them unless you say yes. What we store.
A circle with a plus and minus or a bar, holding a set voltage.
Also known as: Constant voltage source, EMF source symbol
An ideal voltage source holds its terminal voltage whatever current is drawn, and is drawn as a circle marked with polarity. It is an abstraction rather than a component: no real supply behaves this way, which is why circuit models add a series resistance.
Denotes a source holding a specified voltage across its terminals independently of the current drawn.
Contexts: Technical drawing, Electrical equipment
Is an idealisation with no physical counterpart; real sources are modelled as an ideal source with a series resistance representing their limits.
Contexts: Technical drawing, Electrical equipment
A circle containing a plus and a minus sign, or a long and a short parallel bar, with two connections leaving it.
One is an abstraction, the other a real component.