Discussion
A \( 10 \ \mathrm{V} \) Zener is fed from \( 15 \ \mathrm{V} \) through \( 500 \ \Omega \), with no load. The diode current is
Answer: C
All the resistor's current passes through the diode:
\[ I = \frac{15-10}{500} = 10 \ \mathrm{mA} \]
so 10 mA, and the diode must be rated for the 100 milliwatts this dissipates. The other values follow from using the wrong voltage across the resistor. The no-load case is always the worst case for the diode, because every milliamp the load does not take is a milliamp the diode must.
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