Can we measure the potential difference of a p-n junction by putting a sensitive voltmeter across its terminals?
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No, because the volmeter to be used to measure potential difference across the p-n junction must have a very high resistance as compared to junction resistance, which is nearly infinite, if not biased. Apart from it, there are no free charge carriers in the deplention region of p-n junction.
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p-n junction is a semiconductor diode. It is obtained by bringing p-type semiconductor inclose contact with n-type semiconductor. A thin layer is developed at the p-n junction which is devoid of any charge carrier but has immobile ions. It is called depletion layer. At the junction a potential barrier appears, which does not allow the movement of majority charge carriers across the junction in the absence of any biasing of the junction. p-n junction offer low resistance when forward biased and high resistance when reverse biased. Read the above paragaph and answer the following question: (i) Can we measure the potential barrier of p-n junction by putting a sensitive voltmeter across its terminals? (ii) What practical lesson do you draw from the above study?
Assertion: We can measure the potential barrier of a PN junction by putting a sensitive voltmeter across its terminals. Reason: The current through the PN junction is not same in forward and reversed bias.
Assertion : We cannot meausre that potential barrier of p-n junction by putting a sensitive voltmeter across its terminals. Reason: In the depletion layer, there are no free elctrons or holes and in the absence of forward bias, it offers, infinite, resistance.
Can the potential barrier across a p-n junction be measured by simply connecting a voltmeter across the junction ?
Can the potential barrier across a p - n junction be measured by simply connecting a voltmeter across the junction ?
Potentiometer measures the potential difference more accurately than a voltmeter, because
A voltmeter of resistance 994Omega is connected across a cell of emf 1 V and internal resistance 6Omega . Find the potential difference across the voltmeter, that across the terminals of the cell and percantage error in the reading of the voltmeter.
A voltmeter of resistance 995 Omega is connected across a cell of emf 3V and internal resistance 5 Omega . Find the potential difference across the voltmeter, that across the terminals of the cell and percentage error in the reading of voltmeter.
