A Forward-biased p-n junction Diode Has A Potential Drop Of 0.5 V Which Is Assumed To Be Independent Of Current. The Current In Excess Of 10 MA Through The Diode Produces So Much Heating That Burns The Diode. If We Have A 1.5 V Battery To Bias The Diode, Resistor Must Be Used In Series With The Diode So That The Maximum Current Does Not Exceed 5 MA?   

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Question

A forward-biased p-n junction diode has a potential drop of 0.5 V which is assumed to be independent of current. The current in excess of 10 mA through the diode produces so much heating that burns the diode. If we have a 1.5 V battery to bias the diode, resistor must be used in series with the diode so that the maximum current does not exceed 5 mA?   

Solution

Correct option is

200 om

The value of the resistor R must be such that the maximum current i in the circuit is 5 mA. 

Using Ohm’s law, we have 

            

              

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Q10

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