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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GMR Sensor voltage output into magnetic field

I used a GMR sensor (Model AA003-02) inside a electricly adjustable homogenous magnetic field generated by a long coil. In other words the current is proportional to the magnetic field strength. ...
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Voltage Drop Formula for Three Phase Power Systems

I've just started learning about electricity and power systems, and am currently learning about calculating voltage drop for three phase power systems. The book I am reading is explaining how to ...
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Finding the "drop in potential" as current moves through a single resistor of a circuit with parallel resistors

I have four different resistors connected in parallel to a \$24.0 \ \text{V}\$ battery with internal resistance of \$0.500 \ \Omega\$. The resistor values are \$10.0 \ \Omega\$,\$15.0 \ \Omega\$, \$30....
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Finding the voltage available at the terminals of the battery in a circuit with parallel resistors

I have four different resistors connected in parallel to a \$24.0 \ \text{V}\$ battery with internal resistance of \$0.500 \ \Omega\$. The resistor values are \$10.0 \ \Omega\$,\$15.0 \ \Omega\$, \$30....
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Finding resistance for parallel resistors: how is my reasoning incorrect, and what is the correct reasoning?

I have the following circuit: The voltmeter \$V_1\$ measures the voltage drop across the \$9.00 \ \Omega\$ resistor and has a reading of \$4.50 \ \text{V}\$. The reading on ammeter \$A_1\$ is \$I_1 =...
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Mimic a thermistor/variable resistance signal using PWM

I am looking for a way to create a variable resistance signal to mimic the signal that would typically be provided by a thermistor, but by using a digital signal that switches to ground. I currently ...
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Calculate JFET resistance

I'm exploring JFETs at the moment; I'd like to use them as a variable resistor and set the resistance with a control voltage. I'm using it to control a 1Vpp sine wave through ds. I'm using a J201 JFET....
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What are relationship between cable properties and electrical properties?

I was prototyping esp32-cam (microcontroller aka MCU) on breadboard, I saw brownout error message on serial monitor everytime I initialize WiFi then it keeps restarting. After I google for 24 hours ...
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Current in a induction dc motor

SO I am building an induction dc motor and using a battery that supplies 12V and 7.0Ah. The wire I am using is a 0.8mm enamel copper wire and I am trying to find how much current was drawn from the ...
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How to determine type of a BJT by using an ohmmeter?

Our lecturer in Analog Electronic class mentioned about determining the type of a BJT (whether it is PNP or NPN) by an ohmmeter. I know that in some applications we can determine the type by the ...
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Should I include the resistance of capacitors and inductors (reactance) in my schematic?

I generated a DC/DC PS circuit from Maxim Integrated, and got this output: You'll notice that both the inductors and the capacitors have their respective resistances marked (in milliohms). Are these ...
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How does the common emitter configuration offer higher output impedance?

I know that the base-collector region is reverse biased and because of that it offers high resistance but it is the resistance due to biasing. In a video, the person was explaining the hybrid-pi model ...
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Which resistor would be a good choice for temperature measurement from 4K to 300K?

I am building a thermometer for a cryostat which operates at low temperatures (until 4 kelvin). I would like to know the temperature of some parts in my cryostat during the cooling (so from 300 K to 4 ...
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4 answers
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Why does voltage reading increase the greater the resistance load?

I'm new to electronics. So basically I already understand Ohm's law and the math behind why this is the case. What I don't get is the idea behind it. Shouldn't the greater the load resistance be, the ...
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Negative to chassis or separate wire?

In automotive applications typically battery negative is connected to the chassis, right. This makes the chassis be at the same potential as battery negative, but when completing a circuit, ultimately ...
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Resistance seen by capacitor

I'm trying to find the resistance seen by capacitor \$C_1\$, but I'm not getting the correct solution. In order to make the problem simpler, I say that \$R_{C_1}=R_{P_1}||(R_{down})\$. I start off ...
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Determination of equivalent resistance [closed]

I need to calculate the equivalent resistance of this circuit which seems easy in the start as it looks like there are several parallel circuits. But as you can see there are 2 black lines connecting ...
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1 answer
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How to transform resistance between two linear ranges?

This question is motivated by an automotive problem from this question. In a quad vehicle, in a 12V system, there's a fuel sender with 0-100 ohm range, empty to full. The fuel sender was a part of a ...
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Circuit shorting creates less resistance

Using only intuition, without mathematics, why can't the total resistance in the circuit of the 1st image be less than the total resistance in the 2nd image? The 2nd circuit gives more path options ...
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Understanding ohms (resistance) and how to tell a fuel float gauge to tell the OBD II that it's registering fuel or empty [migrated]

I have a Polaris PRO-XP and I've mounted an 30 gallon fuel cell into it. The ODB II on the machine is expecting between 450 ohms in the empty position, and 100 ohms in the full position. The new fuel ...
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Can I connect low-power resistors to achieve a high-power resistive load?

I've designed an 80 W 400 V PFC boost converter and I want to test it with resistive load. but I couldn't find a low-cost high power (20 to 80 watts) resistor in the range of 2k to 10k ohm. Is there ...
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Resistance vs capacitance of conductor

Suppose we have a wire which transmits power. Is there a direct relationship between the resitance (or conductance) of the wire/m and the capacitance of the wire/m? Or they are independent of each ...
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1 answer
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Name of electric component

The conductance of a resistor is defined to be 1/R. What is the name of a electric element which obeys this law? And how do we draw it in a circuit diagram?
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Calculating how much nichrome wire rod is required to heat aluminium at 490°C [closed]

My purpose is to install nichrome wire rod in an aluminium annealing furnace with capacity of annealing 3800kgs of aluminium. The furnace is well insulated. It has two built in blowers to circulate ...
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Clone 862D+ soldering iron heating element

I purchased an ebay 862D+ rework station in 2017 and it has worked great. Recently I broke the ceramic on the heating element but did not break the element itself so I was able to get ohm readings ...
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Voltage Follower not working for low resistance loads

I have simulated a bridge-tied load, which is to be tied to an ultrasonic transducer. The part I'm worried about is the part where the BTL touches the transducer itself. As one can see, the ...
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2 votes
4 answers
324 views

Are there any general "rules of thumb" that one can follow when trying to find equivalent resistances in circuits?

Say I have a "confusing" circuit such as this one: Where I want to find the equivalent resistance between terminals a and b. What are some tips and tricks to do this? I am asking because I ...
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Generate triangle wave with phase shift from square wave

My input is a square wave. The output is a triangle wave. The middle of the high section the square wave should correlate with the peak of the triangle wave output. Are there are examples of circuits ...
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1 vote
3 answers
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Load impedance seen by op-amp

I have a question about the load impedance seen by an ideal op-amp output terminal in inverting configuration. When calculating the load impedance, we set Vin = 0; In one way I could say that the ...
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Connecting resistors to the wires directly decreases the audio output

I am trying to replace a 2 channel speaker with another 1 channel speaker. To do so, I connected every wire (+ & -) to a resistor, then connected both -ves and +ves together (I read how to do it ...
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Using nichrome as a conductor?

Can we use nichrome as a conductor by connecting it in parallel with a small resistor such as 1 ohm resistor to lower its resistance?
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Saltwater Measurement via Arduino

This is a strange question, but I'm trying to learn specific uses for all of the Arduino functionalities. If I were to program the Arduino to spit back the result of analog input into serial as seen ...
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Finding ESR of LCR circuit?

I have an LCR circuit, and I am trying to find the ESR of a capacitor. I bought a 820uH inductor , and an ultra-low 1000pF capacitor, and a 46.6ohm 1% tolerance resistor. Below is my circuit with ...
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Determining the impedance of an unknown component

If I have an antenna and I wish to measure its impedance. I have two impedance values, Z=125.52-j207.36Ohms and Z=8.14-j39.6Ohms, and I do not know which one is correct/ which one applies to this ...
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How do I calculate current when using a power supply?

Edit: I’ve just learned that a 500mA PSU is not going to necessarily output 500mA; it’s not a constant current PSU. It CAN output that much, but only if its components are asking for that much. It ...
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1 vote
3 answers
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Getting 45.6 Ω when it should be 60 or 120 Ω on CAN bus

We have a 2011 Chrysler 6.1L Hemi SRT. We can not get any diagnostic reading at the DLC or OBDII port. We have checked all the wiring, fuses etc. Our readings at the DTC connector are as follows: CAN ...
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Sensor output resistance

I want to design a circuit using a Hall sensor (reference is SS49E, see datasheet). I want to size the output resistance of the sensor. The block diagram of the sensor is: The output current of the ...
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Capacitor and loading effects

If there is a power supply charging a capacitor (e.g. 4 μF) through a resistor (3.2 MΩ), the time constant can be calculated with the capacitance and resistance. If I, however, measured the voltage ...
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Usually Geiger tubes have a recommended 1 to 5 megaohm anode load. What determines that value and what is the effect of increasing the value?

I think title is sufficient. Changes? Dead time, signal out amplitude, plateau character, etc.
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Insulation testing of chassis leakage current/voltage (Megohmmeter)

Previous post I feel my original post was not asked in a correct manner. I previously said I wanted to detect voltage but it now appears I should be detecting current instead. My setup still remains ...
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2 votes
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CCTV cable power rating?

I want to know whether I can use this d-link 3+1 CCTV cable for powering an led strip which runs at 12 volts 1 amp. The led strip is approximately 12 meters away from the smps power adapter. I checked ...
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Struggling to design R2 to simple circuit specifiations

I have set up a nodal equation such that all currents are entering the center node (\$V_x\$): $$\frac{V_1-V_x}{R_1} + \frac{V_2-V_x}{R_2} + \frac{V_3-V_x}{R_3} = 0 \to \frac{V_1-V_x}{R_1} + I_2 + \...
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3 answers
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If I just keep decreasing the resistance of the wire between the load and the battery, does that mean that the current flow is increased?

If I keep decreasing the resistance of the wire connecting the load and the battery, will the current flow increase, until the maximum current level the specific battery can give is reached? If so, ...
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6 answers
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What is the difference between impedance and reactance?

I mean how are they physically different? What does it mean to have imaginary numbers in the reactance?
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How to calculate value of voltage by light intensity?

I want to write the code to turn the LED on when the light intensity that falls on the photoresistor decreases. So in daylight LED is off, and when it's getting dark LED goes on. I know that ...
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Is resistance of a 12V source down to 0.5V and 0.1mA even possible using E12 Series resistors?

I am stumped on this question out of my textbook, its about finding the value of a resistor for a circuit given the source voltage and device requirements in Volts and amps. In this case its 12V ...
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Model of an inductor in Ngspice

I am moving from LTspice to NgSpice. In the former the inductance has a default value of a series resistance of 1milli oHms (that could be set to zero by adding 'Rser=0' in the line command defining ...
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20 votes
3 answers
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Why does the resistance of a space heater decrease as it gets hot?

I came across something I find odd while hacking a space heater into a high power dummy load: my cheap space heater is rated 1.5 kW 110 VAC, so I expected to see less than 8 ohms which, when heating, ...
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2 answers
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Accuracy of analog multimeters

What accuracy should I expect from an analog multimeter that cost 50$ when measuring resistance? It's measuring 1.5 kilohm correctly, when measuring a 10 ohm resistor it's about 30% off. I tested it ...
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PCB tracks as wide as possible or just as wide as needed?

what is the best practice regarding the width of PCB tracks? There are of course a few hard constraints : wide enough to keep voltage drop acceptable wide enough to prevent excessive heating at least ...
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