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Solution


Q.

A potential divider circuit is connected with a DC source of 20 V, a light-emitting diode of glow in voltage 1.8 V and a Zener diode of breakdown voltage of 3.2 V. The length (PR) of the resistive wire is 20 cm. The minimum length of PQ to just glow the LED is ____ cm.           [2024]

Ans.

(5)

VPQ=3.2+1.8=5 V

And, VPR=20 V  (given)

Now 20 V20 cm×ℓ=5 V