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The circuit in figure shows a zener-regulated d.c. power supply. The zener diode voltage is 15 V. The minimum value of RL down to which the output voltage remains constant is—
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- 27 ohm
- 45 ohm
- 15 ohm
- 24 ohm
Correct Option: B
From given figure
VZ = 15 V
| I = | = | 27 | 27 |
| I = | 3 |
| RL min = | = | = 45 Ω | IL (max) | 1 / 3 |
