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A zener diode of power rating 2 W is to ...

A zener diode of power rating 2 W 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 `R_(S)` for safe operation should be _________`Omega.`

Text Solution

Verified by Experts

The correct Answer is:
20
When unregulated voltage is 14V voltage across zener diode must be 10V So potential difference across resistor `DeltaV_("Rs") = 4V and P_("zener") = 2W`
`VI = 2`
`I= 2/10 = 0.2A`
`DeltaV_("Rs)=1R_s`
`4=0.2 R_SimpliesR_S=40/2=20Omega`
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