A resistor obeys Ohm's law (V=IR); the current through it is equal to the voltage across it divided by the resistance (equivalently \$I=\frac{V}{R}\$)
23
votes
19answers
11k views
What's the best way to store and categorise resistors/capacitors/ICs/etc?
I did a big cleanup of my collection of parts today and I now have a big pile of parts on my desk (the majority of which is resistors). My previous method of finding the resistor value I wanted was to ...
2
votes
2answers
246 views
Can I adjust varistor range?
I can connect many resistor in parallel or series to get a final resistance I want in case when I have no necessary nominal out of the box.
I wonder is there such trick that will allow me to easily ...
1
vote
1answer
2k views
Thermistors' colour coding same as the resistors'?
WARNING: 30V was a mistake -- better to keep voltage down 12V as a beginner! I tested it over a very short time. Got the things hot over a long time with much less voltage -- apparently not enough ...
4
votes
4answers
1k views
At what current and voltage Typical Resistors explode?
I don't have an explosion chamber so I cannot test critical values.
If you explode resistors with too high current-voltage combination, does it damage your equipment, such as multimeter and ...
8
votes
7answers
1k views
Best shunt resistor for power meter application?
Looking for a shunt resistor for measuring power usage and was wondering if anyone had any experience with these.
It should be capable of handling 110V/20A in-home circuit.
EDIT: Energy monitors ...
8
votes
3answers
578 views
Should I default to pull-up or pull-down resistor with tact switches?
I understand the basic use of a pull-up or pull-down resistor, including the specific case of using it with a tact switch.
When both are an option I was wondering whether I should favor one over the ...
5
votes
3answers
7k views
What is the purpose of a bias resistor?
Could someone explain what "bias" is.
And why do some devices need an external bias resistor?
23
votes
5answers
10k views
Is there a correct resistance value for pull-up resistors?
The datasheet of the 24LC256 EEPROM states that:
The SDA bus requires a pull-up resistor to VCC (typical 10 kΩ for 100 kHz, 2 kΩ for 400 kHz and 1 MHz).
I thought that any resistor with a kΩ ...
19
votes
5answers
5k views
How does an LM7805 voltage regulator work?
How do most voltage regulator ICs work? Are they the same as hooking up a variable resistor and a voltmeter and turning the knob until you get the desired voltage?
7
votes
5answers
997 views
Red Green Blue LED
Do you need to use different resistors against each of the colours on an RGB LED?
5
votes
3answers
2k views
Why the resistor in this op-amp circuit?
Here's a circuit diagram for a signal response test circuit from the spec sheet for a HA-5195 op amp and looks like a non-inverting amplifier circuit with a gain of 5, plus the 200Ω resistor between ...
11
votes
2answers
4k views
6 Band Resistors, which way should the bands be read
I've just bought a bag of random resistors from Maplin, and can't work out which way round the six band ones should be read.
For instance I have one which is either:
Violet Orange Red Brown Brown ...
