JEE Main 2016 Physics question
A Zener diode with a breakdown voltage of 4 V is connected in series with a resistance to a battery of emf 10 V. The maximum power dissipation rating for the Zener diode is 1 W. The value of to ensure maximum power dissipation across the diode is
Answer: (2)
Solution
While in breakdown the Zener holds its terminal voltage at V, so the maximum current it can pass without exceeding its 1 W rating is
= = = 0.25\ A.
With no load across the diode, the whole of this current flows through the series
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