PHYSICS · Single correct · A Level · Physics · Electronics · Electronics
Problem
When a diode is forward biased, it has a voltage drop of 0.5 V. The safe limit of current through the diode is 10 mA. If a battery of emf 1.5 V is used in the circuit, the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is:
(1) 300Ω
(2) 50Ω
(3) 100Ω
(4) 200Ω