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A zener diode, having breakdown voltage equal to 15V, is used in a voltage regulator circuit shown in figure. The current through the diode is

1. 10mA
2. 15mA
3. 20mA
4. 5mA

Correct answer: 10mA

Solution

To determine the current through the zener diode, we use the voltage across the diode (15V) and the series resistor value (not provided in the question but assumed to be given in the figure). Using Ohm's law, the current can be calculated as (Input Voltage - Zener Voltage) / Resistance. Based on typical setups, the current is most likely 10mA.

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