In the lab, the open-circuit voltage measured across an
unknown circuit's terminals equals
.
When a 1Ω resistor is place across the terminals, avoltage of
appears.
What is the Thévenin equivalent circuit?
What voltage will appear if we place a 1F capacitor
across the terminals?
Mystery circuit
We want to determine as much as we can about the circuit lurking in the impenetrable box shown in
[link] .
A voltage source
V
has been attached to the left-hand terminals, leaving the right terminals for tests and measurements.
Sammy measures
V when a 1 Ω resistor is attached to the terminals.
Samantha says he is wrong.Who is correct and why?
When nothing is attached to the right-hand terminals, a voltage of
V is measured.
What circuit could produce this output?
When a current source is attached so that
amp, the voltage
is now 3 V.
What resistor circuit would be consistent with this and the previous part?
More circuit detective work
The left terminal pair of a two
terminal-pair circuit is attached to a testingcircuit. The test source
equals
(
[link] ).
We make the following measurements.
With nothing attached to the terminals on the
right, the voltage
equals
.
When a wire is placed across the terminals on
the right, the current
was
.
What is the impedance “seen” from the terminals
on the right?
Find the voltage
if a current source is attached to the
terminals on the right so that
.
Linear, time-invariant systems
For a system to be completely characterized by atransfer function, it needs not only be linear, but also
to be time-invariant. A system is said to betime-invariant if delaying the input delays the output
by the same amount. Mathematically, if
,
meaning
is the output of a system
when
is the input,
is the time-invariant if
for all delays
and all inputs
.
Note that both linear and nonlinear systems have thisproperty. For example, a system that squares its input
is time-invariant.
Show that if a circuit has fixed circuit elements
(their values don't change over time), itsinput-output relationship is time-invariant.
Hint : Consider the differential
equation that describes a circuit's input-outputrelationship. What is its general form? Examine the
derivative(s) of delayed signals.
Show that impedances cannot characterize
time-varying circuit elements (R, L, and C).Consequently, show that linear, time-varying systems
do not have a transfer function.
Determine the linearity and time-invariance of the
following. Find the transfer function of the linear,time-invariant (LTI) one(s).
diode
Long and sleepless nights
Sammy went to lab after a long, sleepless night, and
constructed the circuit shown in
[link] .
He cannot remember what the circuit, represented by theimpedance
, was. Clearly,
this forgotten circuit is important as the output is thecurrent passing through it.
What is the Thévenin equivalent circuit seen by
the impedance?
In searching his notes, Sammy finds that the circuitis to realize the transfer function
Find the impedance
as well as values for the other circuit elements.
is it possible to leave every good at the same level
Joseph
I don't think so. because check it, if the demand for chicken increases, people will no longer consume fish like they used to causing a fall in the demand for fish
Anuolu
is not really possible to let the value of a goods to be same at the same time.....
Salome
Suppose the inflation rate is 6%, does it mean that all the goods you purchase will cost
6% more than previous year? Provide with reasoning.
Not necessarily. To measure the inflation rate economists normally use an averaged price index of a basket of certain goods. So if you purchase goods included in the basket, you will notice that you pay 6% more, otherwise not necessarily.
Good day
How do I calculate this question: C= 100+5yd G= 2000 T= 2000 I(planned)=200.
Suppose the actual output is 3000. What is the level of planned expenditures at this level of output?
I am Camara from Guinea west Africa... happy to meet you guys here
Sekou
ma management ho
Amisha
ahile becheclor ho
Amisha
hjr ktm bta ho
ani k kaam grnu hunxa tw
Amisha
belatari
Amisha
1st year ho
Amisha
nd u
Amisha
ahh
Amisha
kaha biratnagar
Amisha
ys
Amisha
kina k vo
Amisha
money as unit of account means what?
Kalombe
A unit of account is something that can be used to value goods and services and make calculations
Jim
all of you please speak in English I can't understand you're language
Muhammad
I want to know how can we define macroeconomics in one line
Muhammad
it must be .9 or 0.9
no Mpc is greater than 1
Y=100+.9Y+50
Y-.9Y=150
0.1Y/0.1=150/0.1
Y=1500
Kalombe
Mercy is it clear?😋
Kalombe
hi can someone help me on this question
If a negative shocks shifts the IS curve to the left, what type of policy do you suggest so as to stabilize the level of output?
discuss your answer using appropriate graph.