Tagged Questions
-2
votes
5answers
534 views
how to calculate total resistance in circuit with parallel and series resistors connected
A battery of EMF 8.0 V and internal resistance r = 1.0 – is connected to an external circuit as shown:
I need to find out the total resistence and my problem is that I dont know which resistors ...
4
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4answers
276 views
More than 2 resistors in parallel
Most people know the formula for the total resistance of parallel resistors:
\$ \dfrac{1}{R_t} = \dfrac{1}{R_1} + \dfrac{1}{R_2} + {}...{} + \dfrac{1}{R_n} \$
If there are only 2 resistors, that can ...
2
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5answers
386 views
Resistors in Parallel
I understand that when you put Resistors in parallel the resistance decreases, my question is why does this actually happen? What causes the Resistance to decrease? When Resistors are in serial, their ...
4
votes
2answers
403 views
Capacitor in parallel with resistor on xoscope amplifier schematic
Short version: Why is C3 necessary in this circuit?
Explanation:
The schematic for the input buffer/amplifier circuit for xoscope is made up of subsections that are mostly broken down in the ...
4
votes
2answers
454 views
Single resistor powering multiple LEDs in parallel where current through resistor is lower than max allowed current for an individual LED
While writing an answer about using multiple diodes connected to a single resistor, I stumbled upon a case about which I haven't read a lot: What happens when we set the resistor so that it sets the ...
12
votes
4answers
7k views
Why exactly can't a single resistor be used for many parallel LEDs?
Why can't you use a single resistor for a number of LEDs in parallel instead of one each?
7
votes
6answers
1k views
6 LEDs in parallel with a single resistor to simplify soldering
I'm trying to wire up 6 RGB LEDs in parallel, all controlled from a single source (well, three sources, one for each colour). The LEDs came supplied with resistors to limit the current of 270 Ohm for ...
5
votes
2answers
766 views
Using Pullup and Pulldown Resistors
I've been researching pullup and pulldown resistors after seeing them used in many digital circuits and while I understand what their purpose is, I haven't found any resource on how to determine the ...
