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# Questions tagged [resistance]

A measure of how much a conductor opposes current flowing through it. It can also refer to a part of a circuit, which has a non-negligible resistance value.

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18 views

### Equations for voltage/current through a transistor

Given the following circuit: I can figure out the current through the 'bottom wire' by doing: ...
39 views

### Is there a difference between measuring the resistance using a multimeter ohm function and using the voltage / current relation?

I need to measure the electrical resistivity of a concrete sample following the procedure described in ASTM C-1760. The procedure requires a 60V DC potential to be applied across the concrete sample ...
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### How to set output resistance of an amplifier to be 50k

I need to build an amplifier using BJTs / resistors / capacitors. It should have specific parameters (up to 5% error), and I’ve reached them all except for the output resistance. The parameters are ...
44 views

### Help regarding Ac current limiting using resistor

I've 12v(Vrms) 1A AC transformer. I need to regulate it to 1to 4ma maximum output without having much voltage drop. Output load is an animal skin which has resistance in it. Can I just use a ...
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### What is the total resistance in this circuit?

simulate this circuit – Schematic created using CircuitLab The parallel bit is easy enough but that 150k ohm keeps bending me over. If you could tell me how you got the answer it would help my ...
198 views

### Is volume controlled through a potentiometer?

Eletronics newbie here. I am building my first prototype (using an Arduino) that includes a volume knob. I want to know if volume is controlled by a potentiometer because I saw this video and it got ...
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### BT136 inner resistance

I found two datasheets for the BT136 triac: Datasheet one Datasheet two But those datasheets didn't mention the inner resistance of the triac (or I couldn't find it.) What's the resistance ...
96 views

### Is the voltage divider in this circuit backwards for what I'm attempting to achieve?

This circuit is from another post (from long ago) where a user helped me build a circuit which would use a BJT as a switch. simulate this circuit – Schematic created using CircuitLab The ...
49 views

### Short and Open Circuit Calculation

Suppose there is a ideal voltage source which can provide infinite power if that is needed in an ideal scenario. Now suppose a resister R is connected across it and the e.m.f is E. So by ohm's law the ...
40 views

### Why does my instrument gauge not work after splicing the wires?

I have spliced my motorcycle wiring harness that leads to the instrument gauge to extend the length. Now only the neutral indicator light works. I soldered and matched each color. Only thing I know is ...
55 views

### Finding voltages in a linear circuit

A linear circuit is shown in the figure. The elements in this circuit have the following values: R = 100 Ohms, R2 = 200 Ohms, R3 = 350 Ohms, V = 5V, and I = 0.004 A. Determine the potentials of ...
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### How to find equivalent resistence of this mixed circuit?

Find equivalent resistance, the current in R5, Voltage of R2 and power of R10. Actually, I don't know if my attempt is right. So, you would point out where there are mistakes, pleased. R10 and R11 ...
44 views

### Measuring Voltage drop across MOSFET 2N7000

My setup is 2.1V on the gate. A 330 Ohm load between Vdd and drain. And Source to ground. I stepped Vdd from 0V to 9V in small increments and measured the current through Vdd to ground. Got currents ...
73 views

### Fraction resistance and negative resistance

Is it possible that the resistance will be fraction or negative number and what's happened?
177 views

### Can a resistance be negative?

I have to calculate the value of a resistor so that my circuit has a certain equivalent resistance. This is the circuit, and here are the values: ...
57 views

### Finding R equivalent

simulate this circuit – Schematic created using CircuitLab When finding Req between M and N i can't understand why current isn't flowing in R3 and R4.
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### Current and resistance

Can anybody explain why my tongue gets a reading on a multimeter. Do I have a current? Why do i have resistance? Why do some things have resistance? I am very confused.
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### How does an e-cigarette dry tank protection sensor work?

E-cigarettes work with a resistance coil which heats liquid into vapor. Some e-cigs have a dry-tank protection, which senses when the coil does not have any liquid to heat, to avoid it getting too hot....
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### Ground with one sensor vs multiple sensors

I'm pretty new to the world of electronics and was working on an Arduino project using load cells and HX711 amplifiers. The project consists of four HX711 connected to the Arduino and Pi, with all ...
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### Circuit solving problem

I am a high school boy and came across this question: I have solved this question by KVL, but how do I solve this question by potential distribution method? What I have tried :) I assume two ...