What is the difference between ideal and practical diode?

Answer 1

An ideal diode is a simplified model of a diode that does not exist but is used for simple circuit analysis.

A practical diode is the real thing. A model of a practical diode used for circuit analysis purposes includes many parasitic components in addition to the diode.

Answer 2

part from the useful attenuators described above, voltage division often occurs unintention-ally. This is shown best when we consider practical voltage and current sources. The ideal of avoltage source, maintaining a constant voltage across a load, is approached to a fair extent bythe well-known batteries and accumulators. However, by short-circuiting a battery, a reducedvoltage is the effect, rather than an infinite current.In fact, the stated (nominal) voltage of 1.5V of the familiar "dry cell" exists only when nocurrent is drawn from it. The more current is drawn, the more the voltage decreases. In fact,this can be explained as a resistance in the voltage source.Thus, a real voltage source can be considered as an ideal voltage source in series with a(small but noticeable) "source resistance"

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src

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. This is also called "internal resistance" or"output resistance", since it is manifest at the output of the voltage source. Thus, a practicalvoltage source can be represented in the way shown in Fig. 1-14A. The source resistanceis not an added component, but rather an unavoidable property of any voltage source. The"load resistance"

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load

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is the representation of the lamp, motor, instrument or whatever isconnected to this voltage source. It is easy to see that source resistance and load resistancetogether form a voltage divider, each getting their share of the total voltage, also called the"electromotive force