Ideal voltage source

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An ideal voltage source is an electrical element which delivers voltage to the circuit with no internal resistance. The voltage across the ideal voltage source is constant and it is independent of the current passing through the source. Ideal source is only a theoretical one for understanding and there is no such ideal source with zero internal resistance. Practically the voltage source has some internal resistance and its voltage depends on the
current through the element.

Symbol of an Ideal Voltage source

The following symbol is used to represent an independent ideal voltage source.

ideal voltage source

The below figure shows the V-I characteristic of an Ideal voltage source with constant voltage and zero internal resistance.

ideal voltage source

V-I characteristics of ideal voltage source

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