Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [equivalent-circuit]

19 questions
9
votes
4 answers

Extending the Delta-Wye/∆-Y Transformation to higher polygons

I was looking at the derivation of the ∆-Y Transformation and decided to replicate the process with a square and its diagonals, i.e. I tried to create a Square-Cross/□-X transformation. But the equations so formed do not seem to have a solution.…
Salieri
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1 answer

Output resistance of an amplifier

While studying amplifiers, I came across the AC equivalent circuit of an amplifier: To calculate the output resistance of the amplifier, the input signal was set to zero and the load resistance was removed as shown in the figure: What is the…
Essar
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2
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3 answers

Why is Thevenin Voltage of this circuit equal to the voltage source?

I am well aware that Thevenin voltage is equal to the open circuit voltage at the end of the circuit. The circuit information are: \$_\$=50∠0 V, \$_\$=5∠0 A, \$_1\$=10 Ω, \$_2=10\$ Ω, and \$_=10i\$ Ω. The circuit diagram is this: My question is…
RK Eshat
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1
vote
1 answer

What is the resistance of this equivalent-circuit?

In order to cofigure an ADC, I need to know the input resistance to the ADC Pin of a uC, designated as R_source in the following equivalent circuit: From R_source the acquisition time TACQ can be read from the following table: TACQ is what I need…
ilja
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1
vote
1 answer

Thevenin Equivalent with Superposition Theorem

I have the following circuit that I found (here) https://www.tutorialspoint.com/network_theory/network_theory_thevenins_theorem.htm The author uses the node analysis in order to calculate the Thevenin equivalent. But I want to calculate \$V_{th}\$…
Homer Jay Simpson
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1
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1 answer

How to find the equivalent inductance of this circuit?

In the image that is given below, I am not able to figure out which is in parallel or in series to what as they are all almost connected to each other. Also, it was given that all inductors are 1mH. Can anyone guide me about how to approach this…
RK Eshat
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1
vote
1 answer

How can I solve this Thevenin equivalent problem?

I came across an exercise in Linear Electrical Circuits that says: Find the Thevenin equivalent in the terminals A,B as shown in the picture below. Regarding the $$R_{Th} = 6||4 = \frac{6*4}{6+4}=\frac{24}{10}$$ But regarding the \$V_{Th}\$ I do…
Homer Jay Simpson
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1
vote
2 answers

Which is the equivalent voltage and resistance values in this circuit with pull ups at different Vcc?

I have two PCB that i have to interconect. In the first one it is R1 (pull-up resistor) in the second one is R2 (pull-up). The yellow rectangle represents the interface between boards. My questions are: Which would be the value of the parallel…
Developing Electronics
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How to convert Thévenin equivalent to Norton equivalent in this schematic?

I am learning the bus admittance matrix from Power System Analysis by Hadi Saadat electrical engineering. I have a very big problem in chapter 6.2 - Bus Admittance Matrix. At the beginning of chapter 6.2 ,it shows me this diagram: Then it says we…
user16266657
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3 answers

Find the equivalent resistance

I have to simplify the following circuit by using equivalent resistance. I know it probably should be very simple to do it, but for some reason, I can’t tell if the two resistors in the “internal” mesh are in series or in parallel with the other…
selenio34
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Do Grainger/Stevenson incorrectly describe an equivalent circuit for a transformer?

The equivalent circuit for a transformer, as shown above, is supposed to be consistent with the following equations: \begin{align} \small{\mathrm{Equation~2.22:}}~V_1&=(r_1+j\omega L_{11})I_{1} + (j\omega…
artist_and_not_EE_by_training
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vote
3 answers

Do no-load current and load current share path in transformer?

In the equivalent circuit for a transformer, does only the no-load current I0 pass through core loss Rc and magnetizing reactance Xm? Or does load current also pass through Rc and Xm? The figure above suggests only the no-load current passes…
artist_and_not_EE_by_training
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0
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1 answer

How do I find the equivalent resistance on this circuit?

This is a circuit that I have on a problem set. I believe that, starting from a, the diagonal resistor is in parallel with the leftmost resistor. From there, the equivalent resistance is in series with the bottom resistor, and this whole equivalent…
big_yoshi
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The two capacitors are in series but positive end of one plate is connected to positive end of the other

Like the title says, my task is to find the initial voltage across the terminals. The two capacitors are in Series with positive end of one plate connected to that of another. The given information are: \$C_1\$ = 12 microFarad, \$V_1\$ = 6 Volts,…
RK Eshat
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0
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2 answers

Equivalent voltage source

I have the following circuit (see picture 1) where the switch \$ 0 - 1 - 2 \$ is in the "state" \$ 0 - 2\$. The values are \$ R_1 = 20~\Omega \$ , \$ R_2 = 30~\Omega \$, \$ R_3 = 10~\Omega \$, \$ I_q = 4~\mathrm{A} \$, and \$ L = 80~\mathrm{mH}…
syphracos
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