In a zener regulated power supply a zener diode with ` V_z = 6.0 V` is used for regualtion. The load current is to eb 4.0 mA and the unregulated input is 10.0 V . What should be the value of series resistor R?
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In order to have a good load regulations, the value of series resistance R should be such that the current through the Zener diode is much larger than the load current. For this, we select the Zener current five times the load current, i.e., `I_(Z)=5xx4=20mA.` The total current through series resistance `R=I_(Z)+I_(L)=20+4=24mA.` The voltage drop across `R=10.0-6.0=4.0V` Therefore, `R=(4.0V)/(24mA)=167Omega`
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