# Questions tagged [passive-networks]

Use this tag for circuits that only contain passive components, such as resistors, capacitors, and inductors. This includes RC, RL, LC, and RLC circuits.

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### Network theorem Source Transformation

When i am using Superposition Theorem i am getting 80W but when i using Source transformation getting 0W.Why getting different answers? Is there anything Hidden in source transformation that I need ...
26 views

### How does the change of load on the Rx side influence the Tx resonance voltage in a wireless powering sysytem

As the circuit shows, U = 5V toggling the polarity in 10KHz. When IL is changed from less than 1mA to 20mA, the P-P voltage of the Tx coil will increase. How should I understand the phenomenon? I have ...
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### parallel RLC circuit / short out? [closed]

The problem said the resistor 300ohms is short out by the switch when t>0s why can this resistor be short out? useless condition or others condition?
207 views

### Is the flow of current in this RL circuit ambiguously defined?

TL,DR: Why does i_L in this point down instead of up? I get two different answers for the current i_2 when I imagine them in these different ways. Or am I (likely) making a mistake or missing some ...
66 views

### i want to know the cut off frequency on the 2 OPAMPS … Do I take 6K resistor and 5K resistor for OPAMP#2

I hope some one can check, I have a signal coming from a source and it goes in to 2 OPAMPS, and both has to be checked for cutoff frequencies... I know 1/2*pi*RC is the formula but my question is how ...
299 views

### why resonance is not considered in RC and RL Circuit

Why resonance is considered in RLC circuit and not in RC or RL Circuit
1k views

### Series RLC circuit problem

I have attached my attempt and the solution provided by my instructor. I am confused on 2 things what it means by "the circuit is in quiescent state" ? why is he getting sqrt(8) in the current ...
73 views

### Proving equivalence between circuits [closed]

On page E-3, example E.3 In the example the author has asked us to prove that the two circuits are equivalent. On searching I found that circuits are considered to be equivalent if they have the ...
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### LC circuit with series diode (finding the linear average)

I've the following series LC circuit: Find the (linear) average of the current trough the diode. The ideal is a ideal component. The initial conditions in the circuit are equal to zero. MY ...
106 views

### how to calculate gain of this LCfilter

Here I plotted L-C filter circuit in spice software, at resonance frequency the output has maximum voltage 4volt whereas input is 6v, how to calculate gain or output voltage at any frequency? so far ...
3k views

### Voltage across capacitor/inductor in RLC circuit

It is said that voltage across capacitor/inductor is higher than the applied AC voltage. How?
152 views

### If we are finding the Thevinin equivalence of the following circuit, Are the inductor and the capacitor in series?

If we are finding the Thevinin equivalence of the following circuit, Are the inductor and the capacitor in series? I should be looking from the 36 OHM resistor right?
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### Know Network Reciprocity From Scatting Matrix

Given the scattering matrix, \begin{array}{l}0.25&0.80-0.80j\\0.80+0.80j&0.30\end{array} Is this a reciprocal network? I know that for a two port matrix, it is reciprocal when S21=S12. In ...
2k views

### How do you determine the effective resistance of a finite grid of resistors?

Disclaimer: I am a geophysicist with limited electrical engineering background. I am not sure if this problem is incredibly easy, incredibly complex, or completely nonsensical. My goal: Determine the ...
155 views

### How possible is producing very high voltage and electric arc by a using this simple setup

I have the basic series RLC circuit in simulation below. As one can see in SPICE simulation, the output voltage at resonance frequency goes upto 1KV: Can I really obtain that much voltage as in the ...
360 views

### Some questions about a magnetically coupled circuit

Below the RLC circuit on the left side by the help of a periodic impulse generator V1 generates periodic damped oscillations with a certain frequency, and the resulting oscillating current couples to ...
248 views

### Impulse response for parallel RLC circuit [closed]

How to find out the Impulse response for parallel RLC circuit?
155 views

### Can an opamp be used in a 75MHz narrow band pass filter?

My exposure to EE is more than half a century old (sorry). I want to investigate the near-field pattern of a variety of antenna configurations at 75MHz. I have purchased an AD8307 broadband detector ...
148 views

### RLC circuit, at what frequencies is the current 0.8A

So I want to know at what frequencies the current is 0.8A. I've calculated the resonance freq to =1006.6 Hz and the current is at that point 1A. So if I understand this correctly there will be 2 ...