Ideal Voltage Source

 Ideal Voltage Source

Ideal voltage source:

A voltage source is claimed to be an ideal voltage source if the terminal voltage of a source remains fixed, whatever be the load connected thereto. In other words, a voltage source should ideally provide a tough and fast terminal voltage albeit this drain (or load resistance) may vary. In the following equation :

VT = I *ZL = (Vs / Zs + ZL ) * ZL= (Vs / I+Zs / ZL )
to make the terminal voltage VT fixed for any value ZL, the only way is to make the inside impedance ZS zero. Thus, we infer that “an ideal voltage source must have zero internal impedance.” The symbol of dc and ac ideal voltage source are concede the next figure:

The following Figure shows the characteristics of an ideal voltage source. The terminal voltage VT is seen to be constant at VS for all the values of load current *.