A Zener of power rating 1 W is to be used as a voltage regulator. If Zener has breakdown of 5 V and it has to regulate voltage which flucated between 3V and 7V , what should be the value of R for the safe operation. `
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Power rating, `P=1W, V_(z)=5V,R_(s)=?, V_(s)=3V "to" 7V` `I_(z_(max))=P/V_(z)=1/5=0.2A, R_(s)=(V_(s)-V_(z))/I_(z_(max))=(7-5)/0.2=10Omega`
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