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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2
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1answer
47 views

Method and probes for measuring resistance of conductive braiding?

Looking for advice on a method to measure the resistance of a piece of conductive braiding. The braiding is a metal plated material; it's flat when pulled taut and expands into a cylinder when bunched ...
2
votes
1answer
44 views

Plane Resistance with Vias

I have a long and wide power trace (0.3" x 3") that is duplicated on several layers of a PCB. For some thermal purposes, there are many thermal vias punched into the trace (See Figure below). I ...
0
votes
2answers
63 views

Circuit analysis (Intro to Parallel Circuits & Series)

We are just in the beginning phases of learning how to simplify circuits by finding equivalent resistance. I've gotten every problem right except for this one. The answer says its 2000 ohms, but I ...
-2
votes
0answers
54 views

What resistor would be needed before two LEDs in series?

I was wanting to use the lowest amount of amps in my project because it contains around 60 LEDs. http://www.rapidonline.com/pdf/55-2484.pdf : The technical description It has a max current of ...
0
votes
1answer
89 views

Can I ignore resistor for IR LED?

I have two IR diodes and I want to connect them to my Raspberry Pi. From Pi I have 3.3V voltage. Diodes are TSAL 6200 . Can I connect them to PNP and my PI without resistor safely with this wiring?
2
votes
1answer
32 views

AC analysis: finding L and R

EDIT: there should be arg[I2] instead of arg[I3] I've tried to replace V1, C1, R1 with Thevenin equivalent, but I've lost in my calculations. Is there any better approach?
0
votes
2answers
81 views

heating a 5 ohm resistance with a 9V Battery

Hi I am working on a project which involves heating a resistor with a 9v battery. I am heating resistance because I want to increase the temperature of a temperature sensor so that I can do something ...
0
votes
1answer
136 views

Finding the equivalent Resistance of acircuit

simulate this circuit – Schematic created using CircuitLab I am a little confused on how to find R equivalent of this circuit because of the wire. Right now I have the following ...
-2
votes
2answers
35 views

Led matrix display atmega32

I need help with an LED matrix I am building for my son, running from an atmega 32 and a BC818 transistor. I have the schematic from http://dhassel.de/projects/cool/led-matrix-display/ In the ...
0
votes
2answers
49 views

Calculated resistance of an LED

I am working on some circuit lab homework this week and am a bit stumped by something I just can't seem to find anywhere in my Circuit Analysis I book. The lab has me construct the following circuit ...
0
votes
1answer
52 views

Input Resistance vs Output Resistance

I am having trouble understanding the difference between these two concepts. I know that input resistance is the resistance looking into the input terminals and output is looking into the output ...
0
votes
2answers
57 views

How do I limit the current supplied to a boost converter

I have a power supply that can supply up to 20 amps at 12 volts, I want to give a boost converter a maximum of 4 amps. I tried using a 3 ohm resistor but the resistor burned up. I want to use the ...
-2
votes
2answers
47 views

increase the power rating of resistor so that higher current can flow through it

how to find a resistance value without using multimeter? resistance power rating is 1/4W. i tried giving 5volts and finding current but the resistor got heated and power supply was giving a beep ...
5
votes
6answers
814 views

What is the cause of voltage drop across a resistor? [duplicate]

We always assign a voltage drop to a resistor when a current goes through it in a closed circuit. I was wondering if this voltage drop is due to dissipated heat from the resistor or is there another ...
2
votes
3answers
89 views

ESD wrist wrap resistance

I use a wrist strap with 1 MOhm resistance connected to a ground Plug Adapter with 1.5 MOhm, so total series resistance is 2.5 MOhm. Is it OK for ESD protection or would it be better to connect the ...
0
votes
2answers
63 views

Equivalent resistance between terminals

How do I find the equivalent resistance between terminals A and F? The only idea I had was simplifying the parallel 300 and 60 resistors, but where to from there?
1
vote
1answer
44 views

Finding the Thevenin equivalent resistance in given circuit

I tried finding the equivalent resistance (between the nodes A&B) for the given circuit, however I can't seem to get it right: simulate this circuit – Schematic created using ...
-4
votes
1answer
59 views

Ohms law applications [closed]

As you change the value of resistance of the resistor,how does this change the current through the circuit and the battery voltage?
0
votes
1answer
37 views

Using multiple wire/rings to provide more current in Slip Ring connector

I'm going to use a slip ring connector (such as this one) to power 6 servos on the other end of a rotary. This slip ring is rated for 2A of current per wire/ring. If the 6 servos share a common +6v ...
0
votes
1answer
48 views

How to generate constant movement given variable opposing resistance?

I need to generate constant movement in one direction given a variable opposing force even while "stalled" (no net movement in either direction) and when the opposing force is greater than the force ...
-2
votes
2answers
77 views

Why is the resistor attached to “postive” terminal? [duplicate]

Alright so as I am learning this I have learned that electrons are arracted to the postive side. So when I seen this photo it confused me why the resistor is on the postive terminal side. (When ...
0
votes
1answer
38 views

class AB amplifier input resistances

I was wondering if you could help me out, what would be the effect of changing R1 & R2. I have looked online, but mustn't be searching in the right place! My guess is that you would adjust them to ...
3
votes
2answers
551 views

Analysing a circuit to determine what is in series or in parallel

This is probably a very basic question but I have the following circuit, I am not sure what is in series and what is in parallel or if they are all in parallel, initially I thought R2 and R3 were in ...
0
votes
0answers
41 views

Why my turntable has less resistance on right channel and has also lower volume than left?

My turntable never had the same volume on both left and right channels. Left channel is about ~10-15% louder so I decided to measure their resistance between the RCAs and the cartridge. Left was ...
3
votes
2answers
140 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. ...
3
votes
2answers
347 views

Unexpected resistance on breadboard

My first question on EE, please be kind. :-) I am trying to learn how the ADC works on this Cypress PSoC 4100 board. The circuit in the picture does nothing but power the board, connect it to the ...
3
votes
1answer
45 views

Equivalent resistance of circuit

I have a simple resistor circuit that i would like to know the equivalent resistance of(as seen from the multimeter terminals): The image is from Multisim and the resistance is here measured using ...
1
vote
1answer
70 views

How much current will LM317 pass in this circuit?

The formula for the output current of a LM317 is: In this schematic, what will the output current be? simulate this circuit – Schematic created using CircuitLab MY approach: I ...
1
vote
1answer
35 views

problem in finding effective resistance

Look to this figure: i have doubt in finding effective resistance b/w the terminals of this type of connections, during my school classes when I study to find effective resistances. When I study ...
0
votes
1answer
48 views

Analog sensor reading and calibration

I have what I think is simple question regarding the use and data calibration of variable analog sensors (such as a force-sensing resistor). As more pressure is applied to this sensor, its resistance ...
1
vote
2answers
51 views

Is there any material that obstructs or resists capacitive sensing?

For example, is there any material I can place over a capacitive sensor, or the finger or conductor approaching it, so that the sensor will no longer activate?
4
votes
1answer
136 views

Which is correct, kohm or kOhm?

Should the unit "Ohm" be capitalized or not? For example, "kOhm" versus "kohm" vs "kΩ", which is most correct?
-1
votes
0answers
13 views

Electrometer mode of universal amplifier [closed]

Explain why a high resistance is used in electrometer mode. A voltmeter can also be connected to amplifier but what is the use of high resistance in universal amplifier electrometer mode. The circuit ...
0
votes
1answer
72 views

Ri and Ro - What do these acronyms mean?

I am trying to make sense of the below circuit diagram. What do Ri and Ro mean? What purpose do the resistors after the Pinouts of Pin 3 and Pin 2 serve? This is the datasheet for the sensor: ...
0
votes
1answer
46 views

How to find thevenin resistance of a capacitor in an op amp circuit?

for the following circuit could someone explain how to find the thevenin resistance across the capacitor? Most answers use the 10K resistance in parallel as the thevenin resistance but I don't ...
14
votes
7answers
5k views

Why can sticking fingers in an electric outlet kill you?

I just wanted to learn some differences between volts, amps, ohms and so forth and came up with this question. If your skin has 100k ohms resistance and the outlet is 220v wouldn't the current flowing ...
1
vote
3answers
142 views

Why can't I measure resistance when there is current on the potentiometer?

Probably a very basic question but I have no idea why this happens. I have a 1K potentiometer. When I measure the resistance over its legs when it is not connected to anything, the results are as ...
-5
votes
3answers
204 views

9-pin mini-DIN - zero resistance between some pins [closed]

There's a volume knob connected to a speaker system with 9-pin mini-DIN. The volume knob contains potentiometer to control volume and is also in charge of turning the system on and off (by turning the ...
3
votes
3answers
66 views

LED typical and forward voltages

So, I was going through the spec sheet of super bright 5mm orange LED, and it was listed that the forward voltage is between 1.8V and 2.5V. Below that there was a property listed as 'typical voltage' ...
1
vote
0answers
47 views

Transmission Line Model (TLM) End Resistance (Re)

I'm looking into the modelling of a transmission line model (TLM) and feel that I'm understanding it fairly well. Although, one parameter keeps popping up with very little explanation as to what it ...
0
votes
2answers
78 views

Does a MicroControllers resistance change with computation?

Does the load resistance of a micro-controller change based on particular programs or instructions that it is currently running? Does adding in extra functionality of the device also have an effect on ...
-1
votes
2answers
160 views

Problem with resistance,electric circuit etc. etc.

In which way a resistance is to be connected with a bulb labelled 120W-60V when it is connected with 220V DC source so that maximum illumination with proper security is maintained? What is the ...
0
votes
1answer
85 views

Measure resistance value between all nodes in a 3x3 resistor grid

I have a Schematic like that: (except the power supply is an Arduino Uno with a voltage divider to measure resistance between any pair of ABC and 123, except C3 of course) How can I get the ...
1
vote
1answer
77 views

Actuating a horn

I recently tried to sound a horn (the type normally used in cars) using a 12V battery. The problem is that that, if I directly connect the horn's terminals to the battery, it works perfectly fine. But ...
0
votes
2answers
40 views

Electrical resistence between two different terminals

I have to calculate the resistance R_AB, R_AC and R_CD. But I'm confused because there are two different terminal, one on the left and one on the right. Can someone give me a hint how to solve this? ...
0
votes
1answer
129 views

My previous theory was wrong, so why does this work?

Hi I am new to electronics, and I have made a light tripwire using an Arduino Uno. I made this on the idea that electricity follows the path of least resistance, which I now know to be false ...
0
votes
1answer
62 views

Motor Voltage known but nothing else

I`ve just got a 1.5-9V motor and I know nothing else. I'm using a 9V battery but I want to know how to change the resistance to slow it down but I have no ways of finding the current flowing through ...
1
vote
1answer
73 views

Load resistance change detection

I am trying to detect load resistance changes. simulate this circuit – Schematic created using CircuitLab I need to monitor R load resistance (glow plug). PWM duty cycle (max) varies ...
0
votes
1answer
49 views

Increasing current by introducing another voltage source in series?

I have a voltage source connected to a load, and after sometime, introduced another voltage source, would the overall current increase? Intially circuit: simulate this circuit – ...
1
vote
1answer
41 views

How to simulate adjustable 'negative resistance' with active components?

I'm building a decade resistance box using 2W resistors, from 10x1M ohm to 10x0.1 ohm. However, due to some contact resistance, the 0.1 to 1 ohm resistance will likely turn out to be ~1.1 ohm to 2 ...