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C. Remember that the concentration of free electrons in a metal with atomic mass A, density d and valence v (number of free electrons per atom) is given by the relation n = Ndv where N A is the Avogadro's constant. i. We consider an aluminum wire (A = 27), density d = 2.7 g. cm-3, resistivity 3.44 u. cm. Calculate the concentration of free electrons (number per m³). ii. Determine the mobility u of free electrons in the international system. D. For each question choose the exact answer(s). i- In an intrinsic semiconductor, the number of free electrons is: Equal to the number of holes Greater than the number of holes a- b- c- Smaller than the number of holes d- None of the previous cases is just. ii- When a diode is polarized in the opposite direction: a- An avalanche effect appears if the applied voltage exceeds a certain threshold b- A current of some micro-amps circulates despite everything in the diode c- It dissipates a strong heat iii- A full-wave rectifier circuit using a tap-off transformer requires: a- Four diodes b- One zener diode c- Two diodes iv- a- Clipping signals b- Full-wave recovery c- Voltage regulation One of the main applications of zener diodes is:

C. Remember that the concentration of free electrons in a metal with atomic mass A, density d and valence v (number of free electrons per atom) is given by the relation n = Ndv where N A is the Avogadro's constant. i. We consider an aluminum wire (A = 27), density d = 2.7 g. cm-3, resistivity 3.44 u. cm. Calculate the concentration of free electrons (number per m³). ii. Determine the mobility u of free electrons in the international system. D. For each question choose the exact answer(s). i- In an intrinsic semiconductor, the number of free electrons is: Equal to the number of holes Greater than the number of holes a- b- c- Smaller than the number of holes d- None of the previous cases is just. ii- When a diode is polarized in the opposite direction: a- An avalanche effect appears if the applied voltage exceeds a certain threshold b- A current of some micro-amps circulates despite everything in the diode c- It dissipates a strong heat iii- A full-wave rectifier circuit using a tap-off transformer requires: a- Four diodes b- One zener diode c- Two diodes iv- a- Clipping signals b- Full-wave recovery c- Voltage regulation One of the main applications of zener diodes is:

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A. i. Draw a power supply based on a 2x9V efficient mid-point transformer and a full-wave rectifier plus filtering. If the diodes each have a waste voltage of 0.7V, what will be the maximum voltage of the capacitor? ii. What is the purpose of a zener diode? Give its electrical symbol. B. We use two cables of length 1 = 2 m and of section s = 10 mm² to start a vehicle whose battery is discharged, linked to a battery of 12 V of a second vehicle. Calculate the available voltage for a starter of a petrol vehicle requiring 100 A and a diesel vehicle requiring 250 A. Which conclusion can you give? We give the conductivity of the copper wire y = 6.10's.m-¹. Exercise 1 C. Remember that the concentration of free electrons in a metal with atomic mass A, density d and valence v (number of free electrons per atom) is given by the relation n = where N is the Avogadro's constant. Ndv A i. We consider an aluminum wire (A = 27), density d = 2.7 g. cm3, resistivity 3.44 µQ.cm. Calculate the concentration of free electrons (number per m³). ii. Determine the mobility u of free electrons in the international system. D. For each question choose the exact answer(s). i- a- Equal to the number of holes b- Greater than the number of holes In an intrinsic semiconductor, the number of free electrons is: c- Smaller than the number of holes d- None of the previous cases is just. ii- When a diode is polarized in the opposite direction: a- An avalanche effect appears if the applied voltage exceeds a certain threshold b- A current of some micro-amps circulates despite everything in the diode c- It dissipates a strong heat iii- full-wave rectifier circuit using a tap-off transformer requires: a- Four diodes b- One zener diode c- Two diodes iv- a- Clipping signals b- Full-wave recovery c- Voltage regulation One of the main applications of zener diodes is:
Transcribed Image Text:A. i. Draw a power supply based on a 2x9V efficient mid-point transformer and a full-wave rectifier plus filtering. If the diodes each have a waste voltage of 0.7V, what will be the maximum voltage of the capacitor? ii. What is the purpose of a zener diode? Give its electrical symbol. B. We use two cables of length 1 = 2 m and of section s = 10 mm² to start a vehicle whose battery is discharged, linked to a battery of 12 V of a second vehicle. Calculate the available voltage for a starter of a petrol vehicle requiring 100 A and a diesel vehicle requiring 250 A. Which conclusion can you give? We give the conductivity of the copper wire y = 6.10's.m-¹. Exercise 1 C. Remember that the concentration of free electrons in a metal with atomic mass A, density d and valence v (number of free electrons per atom) is given by the relation n = where N is the Avogadro's constant. Ndv A i. We consider an aluminum wire (A = 27), density d = 2.7 g. cm3, resistivity 3.44 µQ.cm. Calculate the concentration of free electrons (number per m³). ii. Determine the mobility u of free electrons in the international system. D. For each question choose the exact answer(s). i- a- Equal to the number of holes b- Greater than the number of holes In an intrinsic semiconductor, the number of free electrons is: c- Smaller than the number of holes d- None of the previous cases is just. ii- When a diode is polarized in the opposite direction: a- An avalanche effect appears if the applied voltage exceeds a certain threshold b- A current of some micro-amps circulates despite everything in the diode c- It dissipates a strong heat iii- full-wave rectifier circuit using a tap-off transformer requires: a- Four diodes b- One zener diode c- Two diodes iv- a- Clipping signals b- Full-wave recovery c- Voltage regulation One of the main applications of zener diodes is:
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