Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.

What is internal resistance of voltage source and current source?

April 26, 2017Engineering Internal Mathematics resistance source voltage

0

Posted

What is internal resistance of voltage source and current source?

1 Answer

1

Posted

When considering a voltage source, the internal impedance is in series with the actual source. Since there is a terminal voltage that is (in a perfect world) equal to the potential being generated by the source, the drop across the impedance is zero. This means the internal impedance of a voltage source is zero. Since impedance is defined as (Voltage / Current), a perfect current source would have a conductance defined as (Current / Voltage). With no terminal voltage apparent, the fraction becomes (Current / zero), or infinite. Therefore the internal impedance of a perfect current source is infinite. Note that resistance is only one element of impedance!