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A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a 400 Ω resistor connected in series, the zener current is found to be 4 times load current. The load current (I L ) and load resistance (R L ) are :

1. I L = 20 mA; R L = 250 Ω
2. I L = 0.02 mA; R L = 250 Ω
3. I L = 10 mA; R L = 500 Ω
4. I L = 10 A; R L = 0.5 Ω

Correct answer: I L = 10 mA; R L = 500 Ω

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