Question 221: Semiconductors and Logic Gates

Question

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 ___________ $$\Omega$$.

Accepted Answer

When unregulated voltage is 14 V voltage across zener diode must be 10 V. So potential difference across resistor $$\Delta$$V
Rs
= 4V
and P
zener
= 2W
VI = 2
I = $${2 \over {10}}$$ = 0.2 A
$$\Delta$$V
Rs
= I R
s
4 $$	imes$$ 0.2 R
s
$$\Rightarrow$$ R
s
= $${40 \over {2}}$$ = 20$$\Omega$$

Semiconductors and Logic Gates

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 ___________ $\Omega$.

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