All Questions
Tagged with resistance voltage-divider
37
questions
8
votes
8
answers
3k
views
How does the electricity "know" the ratio of the resistance in a voltage divider?
I'm having a hard time conceptualizing what/how things are working in a voltage divider setup. I've read a couple other questions/explanations where the answerer has said to "not think about it in ...
- 1,751
7
votes
5
answers
7k
views
Are these 2 resistors in parallel?
So I had a circuit to analyse and I needed to find the equivalent resistor and then I arrived to a confusion. Are R1 and R3 in parallel?
Here is the circuit.
simulate this circuit – Schematic ...
- 109
6
votes
5
answers
2k
views
Non-inverting op-amp
Why is resistor R1 connected to the inverting terminal of the op-amp in a non-inverting op-amp configuration? What will happen if we replace it with a short circuit?
- 99
3
votes
3
answers
5k
views
What is the purpose of a voltage divider in a flex sensor?
I've been following this flex-sensor-arduino tutorial on setting up a simple flex sensor with Arduino, and I got confused on this part:
The flex sensor changes its resistance when flexed so we can ...
- 135
3
votes
2
answers
1k
views
Cermet potentiometer temperature coefficients
I'm engineering a system that is temperature-sensitive, between ~-10-30C. I've moved to using cermet potentiometers because of their sub-200PPM/C temperature coefficients.
If I wire such a pot with ...
- 3,229
3
votes
1
answer
1k
views
Replicate thermistor behavior for second sensor
I'm working with an R/C electric motor that has a 10K thermistor sensor built into it, which is connected to a speed control that has basic thermal protection. I would like to build a secondary sensor ...
- 31
2
votes
3
answers
382
views
Next level of resistor divider
I know how to calculate proportions of resistor values in resistor divider, but dont know how to jump into "next level" and calculate the precise values of resistors from proportion :
For example to ...
- 63
2
votes
3
answers
4k
views
Calculate voltage, current and resistance in a complex mixed circuit
How can I calculate voltage and current on each resistor (especially R5) in this circuit? What is its overall resistance? I have no idea how to do this.
- 67
2
votes
3
answers
2k
views
Voltage Divider, increasing resistor value for solar tracker
I am working on a solar tracking device based on arduino and I am using LDR's (Light Dependent Resistors) as voltage dividers.
The wiring is similar to this:
The problem I am facing is that the ...
- 181
2
votes
1
answer
2k
views
Fuel sender - need something to convert ohms to volts?
I need to connect a cars fuel sender(ohms) to a analog input on a GPS tracker (volts)
Here's the catch, in our tests most fuel senders we worked with seem to send the data as ohms/resistance
However,...
- 121
1
vote
2
answers
245
views
Why is there a resistor in this circuit?
Why there is a 220 ohm resistor in this circuit? Can't we just connect the thermistor directly to the base of transistor?
- 1,498
1
vote
2
answers
297
views
Very high resistance
I'm playing around with a very simple setup:
9V battery
light diode
voltage divider (R1 - three 1 kOhm resistors, R2 - one 1 kOhm resistor), which should give me roughly 3V for the diode
The first ...
- 113
1
vote
4
answers
565
views
The effect of combined resistors?
I need to convert 5v to 3.3v, easy. I need an 2k resistor though so i looked if two 1k resistors could achieve the same effect. I found pretty contradictory information on the subject though, could ...
- 83
1
vote
2
answers
1k
views
Voltage Division Problem
I am currently taking MIT 6.002 course to get a head start prior to starting EE next fall. Right now, I am really struggling with this first lab.
Problem:
You have a 6-volt battery (assumed ideal) ...
1
vote
2
answers
470
views
Voltage divider circuit load resistance?
For a test on circuits that I just completed, a question asked about a voltage divider circuit (see below.)
However, we were told to assume that the load had no resistance and was parallel with the ...
- 11