Question

In a Zener diode regulated power supply, unregulated d.c. input of $10$ V is applied. If the resistance $R_s$ connected in series with a Zener diode is $200\,\Omega$ and the Zener voltage $V_z = 5$ V, the current across the resistance $R_s$ is

• A. $15$ mA
• B. $10$ mA
• C. $20$ mA
• D. $5$ mA
• E. $25$ mA

Hint:

Zener circuit: current = $\frac{V_{in} - V_z}{R}$.

Answer 1

Answer: (E)