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When a diode is foward biased it has a voltage drop of 0.5\; V. The safe unit of current through the diodes is 10\; mA. If a battery of emf is 1.5\; V is used in the circuit, the volume of minimum resistance (in ohms) to be connected in series with the diode so that the current doesn't exceed the safe limit is
Option: 1 100
Option: 2 50
Option: 3 30
Option: 4 200

Answers (1)


I_{max}=10 \ mA=10 ^{-2} \ A

V_R=1.5-0.5= I_{max}R\\ \\ R=\frac{1}{I_{max}}=100 \Omega


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