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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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1answer
131 views

How a circuit get short

I am a high school student learning about the circuit, and how the current choose the path with low resistance, I have seen circuits and how one of the resistance among the other resistance get short....
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2answers
57 views

Increase resistance to turn on a light bulb

I’m wondering if it is possible to use a potentiometer to turn on/off a lightbulb in a binary manner. I’m thinking high resistance = light on. Low resistance = light off. Is there such a circuit? ...
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3answers
125 views

Thermal resistance - Temperature transistor

I have a transistor with Vsupply = 24VDC, VCEO = 45VDC, ICE = 20mA. How to calculate the delta T (rise in temperature) of this transistor. I would like to know what thermal resistance I may have at ...
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1answer
21 views

Trouble understanding thevenin's model from AoE Lab

I am using the AoE lab book to teach myself electronics. I am on the voltage divider section, and I am confused at their simplified explanation. I'd like to explain it a different way, but I am not ...
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1answer
32 views

What is the difference between transresistance and differential resistance?

Transresistance is defined as the change in output voltage over change in input current. While differential resistance is defined in the same manner. So what is the difference ?
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2answers
288 views

Microcontroller - Measure Resistance in Circuit

I am creating circuit that will control power of heater coil. For controling power I am using Arduino PWM that controls voltage and by Ohm's Law I am calculating desired power. P = V^2 / R Now the ...
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1answer
37 views

Calculating resistance for integrated circuit with logical gates, so that the circuit works properly

I have found this task with its solution: For the circuit shown below calculate \$R\$ so that the circuit works properly. All gates belong to the \$TTL\$ series. Solution: $$\begin{...
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1answer
45 views

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 ...
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2answers
22k views

What are the terminals in this 6 pin potentiometer?

I want to use my 6 pin potentiometer in circuits so I want to know what all the terminals are for. I know the basic principle in the 3 pin pot. I'm completely new so please answer it in simple terms. ...
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1answer
41 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 ...
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1answer
71 views

Fraction resistance and negative resistance

Is it possible that the resistance will be fraction or negative number and what's happened?
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2answers
162 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: ...
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3answers
55 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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3answers
239 views

How to use a multimeter to test the resistance of my tongue?

I just purchased this cheap-o multimeter: https://www.amazon.com/AstroAI-Digital-Multimeter-Voltage-Tester/dp/B01ISAMUA6/ref=sr_1_1?keywords=astroai+am33d&qid=1551837071&s=gateway&sr=8-1 ...
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3answers
76 views

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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0answers
51 views

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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1answer
24 views

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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1answer
72 views

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 ...
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1answer
34 views

Finding Equivalent Resistance - does order matter?

Conceptual question: When you have a super complicated circuit, does it matter which node you start at when finding equivalent resistance? How about capacitance?
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0answers
44 views

How to calculate equivalent resistance in this circuit?

What is the way to calculate the equivalent resistance between this two terminals? This is pretty simple circuit but i'm not sure what is ok to do and what isn't
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1answer
150 views

Can an inductive load mess up an ohmmeter's reading

I've found a something quite odd with measuring the resistance of a 36uH inductive load (see this earlier question). I can measure the resistance, which is quite low, but then disconnect the probe and ...
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1answer
71 views

Is power balance a relevant factor in the consumption of a house?

Where I live, houses receive up to three phases from the electricity provider. There is a company advertising a power balancing service. They claim that if one of the three phase cables is overloaded,...
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0answers
24 views

Role of independent and dependent sources when calculating equivalent resistance

There are plenty of topics about this question, but I did not find a precise answer. Let's consider two points A and B of a generic circuit and suppose you want to find the equivalent resistance ...
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4answers
21k views

Increasing resistance on speakers

My amplifier is rated at 8ohms for my surround sound but my speakers are 6 ohms. The owners manual says that if the speaker resistance is too low the power protector will blow and that is exactly what ...
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1answer
43 views

Reading of megohm during ground check

During the check of pins on connector with a multi-meter, one of the pins that goes through the relay to provide ground signal, I am getting 8MOhm (8 megohm). I should not be getting anything on that ...
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5answers
6k 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 ...
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0answers
23 views

Thermal resistance of Thermal Interface Material

Can anyone please give information how to calculate the thermal resistance of SIL PAD "TSP A2000" from make Berguist. from The data sheet its specified thinness is 0.254mm, Thermal conductivity (W/m-...
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2answers
101 views

Reducing the circuit

I am high school boy, our teacher gave us circuit and we have to find out the equivalent resistance. . Our professor gave us idea that we can solve this question either by either superposition ...
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2answers
112 views

Need help to analysis & overcome an issue with LM358 OP-AMP

I want to measure the resistance of a coil which its resistance vary in accordance with its temperature coefficient of resistance, the resistance range of the coil vary between 0.12 Ω to 5.00 Ω, at ...
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0answers
28 views

lm35 Temperature Reading increasing with Hot-melt adhesive (Calculations check needed?)

I have one question with this topic: lm35 Temperature Readings are not right after sealing with Hot-melt adhesive (How mush has it Soldering max Temp toleration ?) it answered by this (Thanks from @...
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1answer
238 views

Can a Dependent source be dependent on itself?

I am looking for the Thevenin Resistance here. However, I have no clue what to do with \$i_b\$ and the source dependent on it. This is the entire circuit. \$i_b\$ is the current through the 5\$k\...
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1answer
35 views

Cable length and voltage drop in offgrid solar installation

I have connected my Lithium-ion battery pack(11.1v 100ah ) with my Epever MPPT charge controller using 5M length of 8 AWG cable. when i put load which consume around 12A , the charger controller shows ...
14
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2answers
3k views

How do you calculate the noise of an op-amp circuit?

I think I know how to do this, but you can find a lot of different instructions and calculators online that contradict each other. I have yet to find a clear, concise procedure for calculating the ...
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0answers
88 views

Calculate sheet resistance in finite element method

I have a simulation with several polygonial mesh cells (Voronoi-mesh) and their centers of gravity \$P_i\$, each with its own electrical potential. Every cell has the same height \$h\$ all over. How ...
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11answers
3k views

What is the physical meaning of negative resistance?

I am a bit confused about the physical meaning of negative resistance. Mathematically, a component which has negative resistance shows a decreasing voltage across its terminal when the current inside ...
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1answer
169 views

What's the equivalent resistance of this circuit?

I am a student in 10th grade and our teacher gave us this schematic to work with (Remade with circuit lab): simulate this circuit – Schematic created using CircuitLab He asked us to find the ...
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1answer
148 views

Why for a dipole antenna half wave length is optimum size?

For a dipole antenna, half wave length is optimum size. Why is this so? What I understand is that radiation resistance of antenna is around 50 ohms at this size, which matches with the characteristic ...
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0answers
55 views

Find armature resistance on DC shunt generator

A DC self excited shunt generator has a field resistance of 160ohms generated emf is 420v and supplies a load of 55kw how would u go about calculating armature resistance when terminal voltage is 408v ...
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1answer
181 views

Effective resistance of a cut toroid

How do I find the resistance of a toroid or hollow cylinder that has been cut along a radius, that is, a straight cut from the center to the outer radius? The outer radius of the cylinder is ro and ...
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1answer
112 views

Series/parallel combination of resistance/capacitance in an RC circuit (wrt LCR meter readings)

I have this equivalent circuit I am working on. I have to find out individual values of all components in it. I can measure resistance, capacitance and impedance of the whole circuit. I am not sure ...
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3answers
159 views

How can I realize this nonlinear resistor?

I want to know if it's possible to realize a circuit described by the equation $$I = \sin(w V)$$ where \$I\$ is the current, \$V\$ the potential and \$w\$ a variable which characterizes the single ...
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2answers
68 views

Pressure of an electric contact and resistance

Ok guys, my question is simple, how does the pressure of an electric contact influence the resistance of the human skin?
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3answers
138 views

What is initial contact resistance in relays?

I am reading datasheet of a relay. I see a term, initial contact resistance in relays. What is the definition of this parameter? Thanks.
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2answers
45 views

Confused about Thevenin’s Theorem

I have a hard time trying to understand why Thevenin’s Theorem is the way it is. As per the diagram below, I understand why we take our “Thevenin resistance” that way. But as far as the voltage is ...
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1answer
88 views

Average resistance of MOSFET output characteristics

Suppose we calculate resistance at two points in a MOSFET output characteristics, For example: Vgs is at 5v. At Vds=5V Id=10uA and Vds=2.5V Id=9.3uA. To determine the equivalent resistor of the ...
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3answers
86 views

Conductivity of liquids (3D resistor network)

Hi I'm an electrical engineer but have not seen this problem before. I'mn trying to measure/calculate the resistance of a liquid. Background: I'm working on an electronic device that can come in ...
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0answers
40 views

Thevenin Resistance in a op amp circuit

I created this circuit and I am struggling on trying to figure out the Thevenin resistance for this circuit.
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1answer
107 views

What is the circuit formation in this electric blackbox?

It should be a simple question from my exercise book, but I could not find the solution for some reason. As illustrated, in an electric blackbox, there is one switch (k), one 3-volt battery, three 1-...
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3answers
51 views

Is the maximum current a resistance can draw limited by the maximum current available (current rating) in the power supply?

Let's say I have a single phase power supply at 100 V and 10 amps at my wall outlet. If I were to connect a very low resistance element (say 0.1 ohms), using Ohm's law I could say the resistance draws ...
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1answer
82 views

How can a light bulb run on different voltages (USA and EU)?

There is a concept in EE I don't understand. In Europe we have a 230 V supply voltage and in the USA e.g. 120 V. Now the thing I don't understand, how can I use my charger( or a light bulb) in ...