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10/01/2022 12:10 pm
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A zener diode of power rating 2W is to be used as a voltage regulator. If the zener diode has a breakdown of 10 V and it has to regulate voltage fluctuated between 6 V and 14 V, the value of Rs for safe operation should be _______ Ω.
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10/01/2022 12:14 pm
When unregulated voltage is 14 V voltage across zener diode must be 10 V So potential difference across resistor ΔVRs = 4V
and Pzener = 2W
VI = 2
I = \(\frac{2}{10}\) = 0.2 A
ΔVRs = IRs
= 4 x 0.2Rs
⇒ Rs = \(\frac{40}{2}\) = 20Ω