Questions tagged [theory]
Theory is a contemplative and rational type of abstract or generalizing thinking, or the results of such thinking. Depending on the context
340
questions
1
vote
1
answer
83
views
Does KVL guarantee identical voltages/currents in similar circuits?
I have a question that is a bit abstract. Assuming I have two proper linear circuits, A and B, which have:
The same ideal components (for example, voltage source, inductor, capacitor, resistor)
The ...
- 240
-1
votes
1
answer
80
views
Getting different answers for number of electrons in 1 amp? [duplicate]
I was looking up the number of electrons in a current with 1a and I keep on getting different answers. Some websites put the number at 6.24, some at 6.25 and others at 6.28 (all * 10^18)
Is there some ...
- 53
0
votes
3
answers
130
views
Could QAM using a grid-like distribution be a quantization limitation?
This is a follow up from this previous question discussing why QAM encoding is spaced in a grid like pattern like this one:
versus another with more efficient packing:
After looking at @Attie and @...
- 325
22
votes
3
answers
2k
views
Why does QAM use a grid-like distribution versus a more efficient spacing?
"Stand-Up Maths" recently did a video about QAM/data encoding. He presented a diagram of the encoding spacing for QAM:
I'm from a software engineering background and I couldn't help but ...
- 325
0
votes
3
answers
69
views
Am I correctly interpreting these two fundamental equations about capacitors?
Capacitors follow the fundamental equation \$I(t)=CV'(t)\$, from which we can derive
$$Q'(t) = CV'(t).$$
Recently, I read about the equation that describes the charging of a capacitor:
$$Q(t) = CV(t)\...
- 205
0
votes
3
answers
128
views
What flows in a general circuit?
I've been learning electronics and have noticed there are pretty much only 2 ways people refer to what flows through the wires; electrons or charge.
I get that electrons are a type of charge but not ...
- 1
0
votes
1
answer
45
views
Unit of integral windup reset parameter?
What is the unit of integral windup reset parameter? Is it the same as the unit of time, seconds?
- 45
6
votes
5
answers
674
views
Behavior of BJT collector current in saturation [closed]
Let's assume that we have NPN BJT with absolute maximum rating of collector current = 1A.
Let's assume that we have separate power supplies for base-emitter and collector-emitter.
The collector-...
- 61
3
votes
1
answer
459
views
Diode Power Dissipation
I am having trouble solving this PD question. I feel like it’s straight forward but I can’t seem to get the correct answer. I was curious if I could get help from the community.
Question: A p-n diode ...
- 57
2
votes
1
answer
545
views
Better to use low ESR or high ESR caps?
I'm replacing the old filter capacitors on Marshall guitar amp and I was wondering if I should use low/non-low ESR caps for this.
As my understanding is (which is neither deep nor correct probably) ...
- 175
1
vote
5
answers
141
views
Definition of a short [duplicate]
I know what a short is, or I think I know. Well maybe I don't.
If two wires from a power source are crossed - it's a short. If a component is working normally - not a short. If the component however ...
- 1,609
0
votes
0
answers
49
views
Antennas Far field radiation pattern
I want to understand this Far field graph of an antenna generated in CST, from the picture:
Is this a good radiation pattern?
If yes, then how?
How to explain the graph?
0
votes
0
answers
64
views
Higher Resistance Measurement on Wet Tongue than Dry Tongue?
I'm trying to start learning about electrical engineering as a hobby. I'm reading from a book right now, and it suggests using my multimeter to measure the resistance of my tongue while it's wet and ...
- 1
0
votes
1
answer
125
views
Estimating self-discharge rate of ceramic capacitors from datasheet values DF and ESR
I'm trying to make an estimate for self-discharge rate of a typical small capacitor, such as 0.1 uF ceramic capacitor. Horowitz and Hill says "A better measure of loss at low frequencies is ...
- 15k
0
votes
2
answers
72
views
Define the expression by the waveform [closed]
Could you explain how to define the expression for the dead time \$\theta\$?
$$f_{1}=\frac{2}{2\pi }\int_{\theta }^{\pi -\theta }{V}_{in}\sin(\omega t)d\omega t
$$
$$f_{1}=-\frac{2{V}_\text{in}}{2\pi ...
- 53