define internal resistance of a cell. prove that r = [E/V -1] R where R is the external resistance used ?
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Suppose you are a doctor and you want to inject ‘V’ ml of vaccine in a person’s muscle. Practically all ‘V’ ml won’t go inside that person’s body as some of the vaccine ( suppose ‘iR’ ml) will always remain inside injection/needle.
If ‘E’ ml of the vaccine enters the patient’s body, then by basic mathematics
V = E + iR
*When you want to charge the battery with V volts, the battery gets charged with E Volts only and remaining iR Volts is the voltage drop due to total resistance ( Internal+External )
Explanation:
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