The ideal voltage source I have shown below a voltage source, connected to a node in a circuit. It tries to impose the voltage (depicted by the symbol Vs) on the node it is connected to. The circuit in turn loads it with a current Io. If the voltage source is ideal, then it continues to drive the node (of the circuit it is connected to) to the same value Vs irrespective of how much the current loading (Io) from the circuit is.
