Why Is Internal Resistance Shown Differently in Voltage and Current Sources?

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The internal resistance of a voltage source is represented in series to illustrate how increased current draw results in a voltage drop across that resistance. In contrast, the internal resistance of a current source is depicted in parallel because it allows for current division between the source and the load without affecting the overall current output. This distinction is essential for accurately calculating the effects of loading on each type of source. The series representation for voltage sources demonstrates the impact of load on voltage, while the parallel representation for current sources highlights the distribution of current. Understanding these configurations is crucial for effective circuit analysis.
amaresh92
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why the internal resistance of energy source or cell is shown in series for voltage source and in parallel for current source?
thanks.
 
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Because it doesn't make a whole lot of sense to show it any other way.

Th source resistance is meant to allow you to calculate the effect of loading the source. With an ideal voltage source that has internal resistance, the more current you draw from it, the more voltage is dropped by that resistor, so the voltage for the source as a whole drops. A load in parallel with an ideal source will not affect the voltage at all, so there's no point in showing one.

Likewise with a current source. If the internal resistance is show in series with current source, it won't make any difference. Shown in parallel, the current is divided between the source and load resistance.
 
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