Problem 7.36 PSpice|Multisimweb.cecs.pdx.edu/~tymerski/ece222/HW_02_solution_WI16.pdf · Problem...
Transcript of Problem 7.36 PSpice|Multisimweb.cecs.pdx.edu/~tymerski/ece222/HW_02_solution_WI16.pdf · Problem...
Problem 7.36 PSpice|Multisim
The switch in the circuit shown in has been in position afor a long time before moving to position b at = 0.
Part A
Choose the correct numerical expression for for .
ANSWER:
Part B
Choose the correct numerical expression for for .
ANSWER:
Part C
Find the numerical value of .
t
(t)iL t ≥ 0
A, where t is in milliseconds
A, where t is in milliseconds
A, where t is in milliseconds
A, where t is in milliseconds
(t) = −0.8 + 2.4iL e−25t
(t) = 2.4 − 0.8iL e−25t
(t) = 2.8 + 0.4iL e−4t
(t) = −0.8 + 2.4iL e−4t
(t)vo t ≥ 0
V, where t is in milliseconds
V, where t is in milliseconds
V, where t is in milliseconds
V, where t is in milliseconds
(t) = 19.2 + 41.6vo e25t
(t) = 41.6 − 19.2vo e−25t
(t) = 19.2 − 41.6vo e−4t
(t) = 41.6 + 19.2vo e−4t
( )vL 0+
Express your answer to three significant figures and include the appropriate units.
ANSWER:
Part D
Find the numerical value of .
Express your answer to three significant figures and include the appropriate units.
ANSWER:
= ( )vL 0+
( )vo 0+
= ( )vo 0+
Problem 7.42
The switch in the circuit in has been closed for a long time.A student abruptly opens the switch and reports to herinstructor that when the switch opened, an electric arc withnoticeable persistence was established across the switch,and at the same time the voltmeter placed across the coilwas damaged.
Part A
On the basis of your analysis of the circuit in , canyou explain to the student why this happened?
Drag the terms on the left to the appropriate blankson the right to complete the sentences.
ANSWER:
Help
small
large
also appears
doesn't appear
Opening the inductive circuit causes a very
voltage to be induced across the
inductor . This voltage across the
switch, causing the switch to arc over. At the same
time, the voltage across
damages the meter movement.
Reset
L
L
Problem 7.44 PSpice|Multisim
The switch in the circuit in has been open a long timebefore closing at = 0.
Part A
Find for .
Express your answer in terms of , where is in mill iseconds.
ANSWER:
t
(t)io t ≥ 0
t t
= (t)io A
Problem 7.51
Assume that the switch in the circuit in has been inposition a for a long time and that at = 0 it is moved toposition b.
Part A
Find .
Express your answer to three significant figures and include the appropriate units.
ANSWER:
Part B
Find .
Express your answer to three significant figures and include the appropriate units.
ANSWER:
Part C
Find for .
Express your answer to three significant figures and include the appropriate units.
ANSWER:
t
( )vC 0+
= ( )vC 0+
(∞)vC
= (∞)vC
τ t > 0
= τ
Part D
Find .
Express your answer to three significant figures and include the appropriate units.
ANSWER:
Part E
Choose the correct expression for .
ANSWER:
Part F
Find .
Express your answer in terms of , where is in mill iseconds.
ANSWER:
i( )0+
= i( )0+
(t), t ≥ 0vC
V, where t is in seconds
V, where t is in second
V, where t is in seconds
V, where t is in seconds
(t) = 150 + 270vC e1000t
(t) = 15 + 27vC e−t
(t) = 150 − 270vC e−1000t
(t) = 15 − 27vC e−t
i(t), t ≥ 0+
t t
= i(t) mA
Problem 7.61 PSpice|Multisim
The switch in the circuit shown in has been in the OFFposition for a long time. At , the switch movesinstantaneously to the ON position.
Part A
Find for .
Express your answer in terms of , where is in mill iseconds.
ANSWER:
t = 0
(t)vo t ≥ 0
t t
= (t)vo V
Problem 7.69 PSpice|Multisim
There is no energy stored in the circuit in at the time theswitch is closed.
Part A
Find for .
Express your answer in terms of , where is in microseconds.
ANSWER:
Part B
Find for .
Express your answer in terms of , where is in microseconds.
ANSWER:
Part C
Find for .
Express your answer in terms of , where is in microseconds.
ANSWER:
i(t) t ≥ 0
t t
= i(t) mA
(t)v1 t ≥ 0+
t t
= (t)v1 V
(t)v2 t ≥ 0+
t t
= (t)v2 V
Part D
Find for .
Express your answer in terms of , where is in microseconds.
ANSWER:
Part E
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(t)v3 t ≥ 0+
t t
= (t)v3 V