# Tagged Questions

It's a measure of how much an 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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### Approximating a “Not Connected” pin on an IC with a high value resistor

I'm looking at using this[0] chip as a difference amp. However, I would like to be able to change the gain electronically. For this chip, the gain is set by either leaving unconnected, or grounding, ...
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### What is the purpose of the diode in this diagram?

If a diode causes resistance then the path of least resistance would always be to ground. So what is the point of this diode?
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### Would 2 100k Ohm resistors provide the same as a 200k ohm in series?

Practically what it says in the title. I would also like to know if it would emit more heat and would the tolerance be higher?.
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### Permutation-based parallel-by-serial calculation of resistance in a circuit

We have employed a computational method for identifying order of receipt of signals from senders based on a telecommunications and/or EE technique. However, we would like to find out which ...
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### Relation between battery cell capacity & internal resistance

I'm trying to design a large battery pack, that should provide a given amount of power, with a reasonable amount of heat dissipations. To do so, I have three degrees of freedom: indidividual cell ...
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### Measuring surface and volume resistance of a cylinder with a multimeter

I'm trying to measure the surface and volumetric resistance of a cylinder shaped object using a multimeter. At what points should I place the probes, and what formulas should I be using to calculate ...
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### Modify pot to lower value while maintaining full range?

So i have a bunch of 100k pots. But i need a few pots that goes up to maximum of 100 ohms. I have tried to put resistors in series with the pot to limit the range and it does work, but the pot gets to ...
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### Resistance of electronic circuits

I am currently trying to build a Regulated DC Power Supply for an electronic piano. I am trying to find the minimum capacitance that I need to able to reach the desired ripple voltage. To find my ...
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### AC Resistance Measuring Circuit

I'm trying to create a project to measure a resitance using electronics and a MCU ADC, and i'm having serious doubts about it and i could use some advices. My first two contrains are that the measure ...
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### how does negative diffferential resistance in a PCR work?

I understand that up until a point (Vforward), the differential resistance is positive. And then it turns negavive, and as the voltage increases, the current decreases. But what physical phenomena can ...
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### What is the significance of the current rating of a power source?

Assume, I have a copper coil (solenoid) with exactly 1000 turns. When I connect a multimeter across the 2 ends of the coil, the multimeter gives a resistance value of 20 ohms. Now I have 2 power ...
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### Two batteries in parallel by a long cable

I want to build a system where I have a solar charger connected to one 12V battery, which is then wired in parallel by a long cable (30 meter, 2.5 mm2) to the other battery. Will both batteries ...
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### Tool, algorithm or method to know which resistors to use for an equivalent resistance $R_T$?

Say I have to get a resistance $R_{T}$ and I have a bunch of resistors, $R_1, R_2, \ldots, R_n$. Does there exist a tool, algorithm or method that gets the resistance value closest to $R_T$ ...
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### How to prevent small LED's from flickering [duplicate]

Hello I have some small LED's connected to a logic circuit. The circuit is supplied with 5v DC current. simulate this circuit – Schematic created using CircuitLab The LED's flicker when ...
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### How to calculate required resistance? [duplicate]

Hello I have a question regarding resistance. I have a 5v supply and I want it to be brought down to 1v at a certain part in the circuit. How do I Know how much resistance I need to go from 5v to 1v? ...
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### Increasing sensitivity for voltage measurement

I am trying to differentiate between two kind of marbles. I am using the marbles as a second resistor in a voltage divider and measuring the voltage drop on it. Theoretically there must be a ...
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### Why do RI=RL equal in maximum power transfer theorm?

I know mathematical proof I need explanation. Why this happen.That doesn't make any sense to me.I know that in series connection current (I)is same.But here  current flow is changing with different ...
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### Get practial resistances for the Current Divider [closed]

My understanding The resistance as seen through the load is just Rs, Therefore 60K < Rs < 80K. Is (current Through Rs Resistance) IL (current through RL ...
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### When conversing, what is a “big resistor”?

In casual conversation, what does "a big resistor" typically mean? Does it mean a resistor with a high resistance or a physically large resistor? Or, is this just bad terminology that should be ...
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### Deciding On A Resistor For an LED

Let me preface: This is my first post on this exchange, so I will try to provide as much context as possible. If some details are lacking, or I've left this question overcooked, I apologize. So, I am ...
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### Are there side effects to using too much resistance for an LED?

I have a 9v battery and a standard red led from reference 1.7v drop and I want it to draw 20 ma also from reference. so id need a 365 resistor. to my understanding if i have too little resistance then ...
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### How to create a linear current response from a passive pot circuit?

I am wanting to linearise the current response of a circuit which currently has the resistance change from a linear pot. I have a current input that I want to test using a test jig/simulator. The ...
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### Why DC resistance is used in MOSFET?

With mosfets there are two resistances called DC resistance Vds/Ids and AC resistance dVds/dIds at the operating point. I am wondering about the purpose of giving the DC resistance here? Where the ...
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### AC source resistance problem while simulating transformer in LTSpice

I am trying to build a Voltage quadruple circuit. But as per my requirement ,the source I will be using has a resistance of 25 ohms.As the input signal to too small I need to use a transformer to ...
300 views

### What does impedance control on a PCB mean [closed]

I understand that when the electrical length is less than 1/10 of the trace length I would have to go in for impedance matching. A PCB impedance is controlled by its stack up. THat is thickness of ...