Topic: Electronics Engineering
A5 V reference is drawn from the circuit shown in the figure. Zener diode of 400 mW and 5 V with firing current of 5mA is used. The value $R_{s}$ is
- A. 50 ohms
- B. 500 ohms
- C. 75 ohms
- D. 470 ohms
Answer: A. 50 ohms
Explanation: $R_{s}=\frac{10-5}{100}k\Omega = \frac{5}{100}\times1000~\Omega=50~\Omega.$