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PRACTICE / Zener voltage regulation

Where does the spare current go?

A 12 V supply feeds a 300 Ω resistor and a node clamped to 6 V by an ideal regulating Zener. A 600 Ω load connects from that node to ground.

Find the Zener current.

Organize the givens & assumptions
  • Vs = 12 V
  • Vz = 6 V
  • Rs = 300 Ω
  • RL = 600 Ω

DC steady state; ideal 6 V Zener regulation provided its reverse current is nonnegative; ideal resistors and wires.

  1. A30 mA30\ \mathrm{mA}
  2. B0 mA0\ \mathrm{mA}
  3. C10 mA10\ \mathrm{mA}
  4. D20 mA20\ \mathrm{mA}

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