In a regulated power supply, two similar 15 V zeners are connected in series. The input voltage is 45 V d.c. If each Zener has a maximum current rating of 300 mA, what should be the value of the series resistance ?
Correct answer: B. 50 O
- A. 10 O
- B. 50 O
- C. 25 O
- D. 40 O
Explanation
The two zeners require 30 V total, leaving 45 - 30 = 15 V across the resistor. At the 300 mA maximum current, R = 15/0.3 = 50 ohms.
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