Problem 42. (c) P = 400 mW = VzIz = (10 V)I) max 400 mW Iz = = 40 mA 10 V = IR - 1z = 45.45 mA – 40 mA = 5.45 mA %3D min max V, 10 V = 1,834.86 Q L 5.45 mA min Large R1 reduces IĻ and forces more of IR to pass through Zener diode.

Electric Motor Control
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ISBN:9781133702818
Author:Herman
Publisher:Herman
Chapter59: Motor Startup And Troubleshooting Basics
Section: Chapter Questions
Problem 12SQ: How is a solid-state diode tested? Explain.
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ZENER DIODES: Answer letter C only. Answers are already GIVEN. I just need you to explain them in plain English. Draw additional circuits if necessary to state your point.

10 Zener Diodes
*42. a. Determine VL, I1, Iz, and IR for the network of Fig. 186 if R1 = 180 N.
b. Repeat part (a) if R1 = 470 N.
c. Determine the value of R1 that will establish maximum power conditions for the Zener diode.
d. Determine the minimum value of R1 to ensure that the Zener diode is in the “on" state.
R$
IL
220 2
IR
Vz = 10 V
= 400 mW
PZ max
20 V
VL
FIG. 186
Problem 42.
(c) P = 400 mW = V,lz= (10 V)(I)
Zmax
400 mW
Iz =
= 40 mA
10 V
I
IR -1, = 45.45 mA – 40 mA = 5.45 mA
Lmin
R,
Zmax
VL
10 V
= 1,834.86 Q
I,
5.45 mA
Large R, reduces I, and forces more of IR, to pass through Zener diode.
Transcribed Image Text:10 Zener Diodes *42. a. Determine VL, I1, Iz, and IR for the network of Fig. 186 if R1 = 180 N. b. Repeat part (a) if R1 = 470 N. c. Determine the value of R1 that will establish maximum power conditions for the Zener diode. d. Determine the minimum value of R1 to ensure that the Zener diode is in the “on" state. R$ IL 220 2 IR Vz = 10 V = 400 mW PZ max 20 V VL FIG. 186 Problem 42. (c) P = 400 mW = V,lz= (10 V)(I) Zmax 400 mW Iz = = 40 mA 10 V I IR -1, = 45.45 mA – 40 mA = 5.45 mA Lmin R, Zmax VL 10 V = 1,834.86 Q I, 5.45 mA Large R, reduces I, and forces more of IR, to pass through Zener diode.
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