Figure Shows a diode connected to an external resistance and an e.m.f. Assuming that the barrier potential developed in diode is `0.5 V`, obtain the value of current in the circuit in milliampere.
Text Solution
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Here, `E=4.5V, R=100Omega`, voltage drop across p-n junction`=0.5 V`. Effective voltage in circuit, `V=4.5-0.5=4.0V` Current in the circuit, `I=V/R=4.0/100=0.04A` `0.04xx1000mA=40mA`
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