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A zener diode, having breakdown voltage equal to $15 \mathrm{~V}$, is used in a voltage regulator circuit shown in figure. The current through the diode is
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Verified Answer
The correct answer is:
$5 \mathrm{~mA}$
For I $1 \mathrm{k} \Omega$
$$
i_1=\frac{15}{1}=15 \mathrm{~mA}
$$
For II $250 \Omega$
$$
\begin{aligned}
& i_{250 \Omega}=\frac{20-15}{250}=\frac{5}{250} \\
&=\frac{20}{1000}=20 \mathrm{~mA} \\
& \therefore \quad i_{\text {zener }}=20-15=5 \mathrm{~mA}
\end{aligned}
$$
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