All Questions
10 questions
0
votes
1
answer
188
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Diodes and resistors theory
I came across a problem which I cannot calculate by theory.
How does this circuit with diodes and resistors work?
In the above diahram, I can calculate the current simply by subtracting the voltage ...
- 45
3
votes
4
answers
3k
views
What exactly does a resistor's tolerance rating mean?
I thought that I had this pretty much figured out over 30 years ago during my initial schooling, but various answers posted to a support forum of a major semiconductor manufacturer(name withheld to ...
- 1,093
-2
votes
1
answer
189
views
How can a resistor be given a positive and negative characteristic?
This question is not pertaining to a circuit, but to individual parts itself.
If for any reason, i want to make a resistor have a positive and negative charge on its either ends, what would be the ...
user188171
2
votes
2
answers
6k
views
How to calculate value of R2 in this circuit?
I'm reading a Floyd electronics book and working through some problems. This one has me stumped however. I already know the answer as it's given in the book (110k). However, I don't know how to ...
- 21
10
votes
1
answer
4k
views
How serial resistors actually reduce EMI?
I am recently working with a GSM based system, and there was this advice in the datasheet of the GSM module:
22 Ω resistors should be connected in series between the module and
the SIM card ...
- 6,443
1
vote
1
answer
975
views
How to solve first-order RC circuit?
I've got a question, and I just keep getting myself confused when I try to solve it.
The problem asks to find voltage and current and resistor currents transients (the switch is opened at t=0). Before ...
- 21
0
votes
3
answers
217
views
Why doesn't linear resistance scale proportionally with the square of length?
I have an in depth question about basic proportionality of resistance. Why doesn't it scale with the square of length? I ask this because what is causing the potential difference on two leads is ...
- 183
2
votes
3
answers
7k
views
How can the SI unit of resistivity [Ωm] be interpreted?
The way I interpret the resistance \$R\$ of a resistor, which has dimensions \$ [\frac{\mathrm{V}}{\mathrm{A}}] \$ is: how many volts must be applied across the resistor to achieve 1 ampere of current?...
- 123
-3
votes
1
answer
95
views
How would i go about finding Rl when rl is r3
How would i go about finding Rl :/ I'm so lost iv looked for examples and all they have done is confuse me
- 11
2
votes
4
answers
3k
views
Resistors and the water analogy
The the most prevalent analogy for understanding electricity is the water hose one. I personally like this because it's very understandable but I have a question about how this works with resistors.
...
- 371