The zener voltage in the circuit shown is \( V_Z = 20 \, V \). The load resistance \( R_L = 5k\Omega \) and the resistance \( R_S = 10k\Omega \). If the input voltage is \( V_S = 100 \, V \), then the current through the zener diode in milliampere is:
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In Zener regulator, always calculate series current first, then subtract load current to get Zener current.