All Questions
Tagged with energy circuit-analysis
13
questions
0
votes
1
answer
63
views
Time bounds for power and energy in RL and RC circuits (natural response)
I am curious about how the time bounds in power (t>=0+) and energy (t>=0) are developed in the natural response of RL and RC circuits. For the RL circuit, the natural response of the current is $...
- 21
1
vote
1
answer
206
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Construction of a Lagrangian function for a circuit
I was reading the paper "Introduction to quantum electromagnetic circuits", by U. Vool and M. Devoret and I am stuck in the construction of a Lagrangian function for the example LC circuit ...
- 11
0
votes
1
answer
202
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"Power Loss" in the Definition of Q-factor from wikipedia [closed]
The stored energy definition of the quality factor \$Q\$ from wiki Q-factor from wiki
is given by
$$ Q = 2\pi \frac{\text{energy stored}}{\text{energy dissipated per cycle}}=
2\pi f_0 \frac{\text{...
- 281
0
votes
2
answers
353
views
Confusion in selecting number of state variables
Generally we take no. Of state variable equal to number of independent energy storing elements ,
let's take two examples -
1.a RC circuit with voltage source as an input ,so here we can take ...
- 1,184
1
vote
1
answer
190
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Difficulties with capacitor circuit analysis
I have been given this question by one of my lecturers and have been having difficulty with it. I was wondering if anyone could help me.
In the circuit of Fig. 1, switch SW1 has been closed, and ...
- 11
0
votes
3
answers
2k
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Dissipation and Impedance
it is known that power losses (which become heat) in circuits are due to resistances, because of Joule Effect. But sometimes I read that dissipation is due to the real part of a certain impedance, and ...
- 3,550
1
vote
2
answers
466
views
Getting negative energy in a coil (RLC-circuit) after opening the switch
I've the following circuit:
simulate this circuit – Schematic created using CircuitLab
The switch was 'forever'closed and a certain time \$t=0\$ I open the switch. I tried to find the energy ...
- 13
0
votes
1
answer
108
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Delivered energy of a RLC circuit - proof
I have an RLC circuit with two resistances \$R \$ and \$R_i \$ in serie.
On my book there is the expression of the stored energy (\$C \$ capacitance, \$E \$ voltage on the capacitor):
$$W_s = \frac{1}...
- 482
0
votes
1
answer
61
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Thyristor in a choppercircuit
I've the following kown values:
Switching on loss is \$\text{E}_\text{on}\space\text{J}\$ in \$t_\text{on}=\tau_\text{on}\space\text{s}\$
Switching off loss is \$\text{E}_\text{off}\space\text{J}\$ ...
- 49
12
votes
6
answers
24k
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Why can I use P = I²R but not P=V²/R when calculating energy lost in a circuit?
I am working through a book of problems and am confused by the answer to this one:
A 12 V battery supplies 60 A for 2 seconds.
The total resistance of the wires in the circuit is 0.01 Ohm.
Q1. What ...
- 561
0
votes
1
answer
171
views
How do I work out energy stored in a capacitor bank?
I would like to know how to work out energy stored in a capacitor bank ?
I have done my own working outs and have reached an answer of 0.192J, I don't know if this is correct ?
- 1
0
votes
2
answers
121
views
Energy absorbed by the condenser
If the current \$i=0\$ the total energy absorbed is:
\$E_{tot}=E_C+E_L\$, where \$E_C\$ is the energy absorbed by the condenser and \$E_L\$ that absorbed by the inductor.
Now:
\$E_C=\frac{1}{2}C v^...
- 167
6
votes
3
answers
1k
views
How long can I practically power an IC with a capacitor?
If I have, for example, an IC that draws 10mA @ 3.3V, how large of a capacitor would I need to power it for 2 minutes? 5 minutes?
I understand that using capacitors to power an IC is not the most ...
- 307