Question

Why is practical volatage source has a resistane=0?

Answer 1

The internal resistance of an ideal voltage source is zero; it is able to supply or absorb any amount of current. The current through an ideal voltage source is completely determined by the external circuit. When connected to an open circuit, there is zero current and thus zero power.

Answer 2

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The internal resistance of an ideal voltage source is zero; it is able to supply or absorb any amount of current The current through an ideal voltage source is completely determined by the external circuit. When connected to an open circuit, there is zero current and thus zero power