) A 18 Vde is applied to a zener diode in series with a resistor and draws 80 mA
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Question
) A 18 Vde is applied to a zener diode in series with a resistor and draws 80 mA current What is the resistance of the resistor. The zener voltage is 6.2 V bby taking into account its impedance 12 12) When the source voltage increases in a zener regulator, the current that remains approximately constant is the A) load current B) total current C) zener current D) series current. 13) 13) Consider a practical forward-biased diode If the voltage at the anode were 10 V, what is the voltage at the cathode measured with resperct to ground A) 10 v B) 10.3 v. C) 10.7 V D) 9.3 v 14) 14) A reverse-biased silicon diode is connected in series with a 12 V source and a resistor. The voltage across the resistor is A) 0.3 V B) 0.7 V coV D) 12 V 15) If the load resistance decreases in a zener regulator, the series current A) stays the same. B) increases. C) equals the source voltage divided by the series resistance. D) decreases 16) A silicon diode measures a high value of resistance with the meter leads in both positions. The trouble, if any, is A) the diode is internally shorted. C) the diode is shorted to ground B) the diode is open. D) nothing the diode is good. 17) When a zener diode is forward-biased, it 17) A) emits visible light. C) exhibits a voltage drop of 4.2 V B) operates like a rectifier diode. D) conducts no current. 15) A reverse-biase slicon diode is connected in series with a 12 V source and a resistor. The voltags 15) across the diode is A) 0.7 V B) 0 V C) 12 V. D) 0.3 V. 19) In a bridge rectifier, which of the diodes will be conducting in the negative cycle of the input? 19) io.i 120 V ams 60 Hz Output D, D 1000pP All Modes are IN4001 A) D1, D3 C) all four diodes B) D2, D4 D) none of the aboveExplanation / Answer
11]We know that by ohms law,
Resistance = VR / iR
= [18-6.2]/0.080
= 147.5 ohm. Answer
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