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A Zener of power rating 1 W is to be use...


A Zener of power rating 1 W is to be used as a voltage regulator. If zener has a breakdown of 5V and it has to regulate voltage which fluctuated between 3V and 7V, what should be the value of `R_(s)` for safe operation (See figure)?

Text Solution

Verified by Experts

`P=V_(Z)I_(Z)`
`therefore (P)_("max.")=V_(Z)(I_(Z))_("max.")" "(because V_(Z)=` constant)
`therefore 1 = 5xx(I_(Z))_("max")`
`therefore (I_(Z))_("max".)=(1)/(5)=0.2A`

Here
`v_(i)=I_(Z)=R_(S)+V_(Z)`
`therefore (V_(i))_("max".)=(I_(Z))_("max.")R_(S)+V_(Z)`
`therefore 7=0.2R_(S)+5`
`therefore R_(S)=(7-5)/(0.2)=(2)/(0.2)=10Omega`
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