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Jan16-12 Greg Bernhardt
Even as a kid, I saw beauty in old devices. That made me want to understand how they worked. I had lots of old...
Jul21-14 12:14 AM
dlgoff
21 4,017
Hello, I haven't learned anything about micro controllers yet but I wanted to get a head start since I hear that...
Jul21-14 08:30 AM
Windadct
21 5,225
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Mar26-08 12:32 PM
berkeman
0 29,237
ansoft, maxwell Sticky Thread Pinned: Maxwell 3D (ANSOFT) ( 1 2 3 ... Last)
Dear all, I'm a new user and I like to exchange information about the use of this tool. From my point of view tool...
Jul5-14 05:32 AM
hussain_aamir
193 82,066
I came across another good search engine today looking for a datasheet, so I thought I'd try starting this thread for...
Dec3-13 12:53 AM
doubtbook
27 54,224
I've occasionally been asked by some of the students I've mentored or TA'd over the years, "What's in your toolbox? ...
Jul13-14 10:34 PM
NATURE.M
63 74,160
Hey, I'm just starting out Electrical Engineering but I need some help. (edit) My Lab prof didn't explain to well. A...
Feb7-06 09:38 AM
berkeman
5 2,202
Hello all, I've been trying to measure the resistance of a pin, which the supplier spec at around 15mohms. I am...
May17-10 04:28 AM
sophiecentaur
14 4,998
Resistance=resisivity(of a certain material)Xlength/cross-sectional area resisivity is expressed in ohm-cm I have a...
Mar12-10 02:08 AM
Studiot
11 3,076
hey dudes so i've a lightbulb that says 60w 230v so i figure it draws 60/230 amps so i figure its resistance is...
Oct19-07 10:00 PM
ranger
4 32,526
I've just calculated the resistance of a solenoid I'm making, but it seems far too low. 240 turns of 1.6mm wire, 30...
Mar30-11 12:34 PM
sophiecentaur
4 1,947
Is the impedance of an antenna infinite (since an antenna is an open circuit, with the ends bent opposite to each...
Jan5-12 08:38 PM
vk6kro
13 1,759
Hi All, I have this clarification, if I have a resistor element of any value and if the physical length of the...
May18-12 04:00 AM
vk6kro
3 693
There are different levels of earthing pits. Like transmission stations, local substations, etc. Can someone specify...
Jul6-09 05:58 AM
i.mehrzad
2 5,961
Can anyone tell me what is the internal resistance of LED? I mean is that very high or low??? Usually how much current...
Jan15-11 10:02 AM
vk6kro
1 1,855
Hi, Just had a bit of a heated discussion with a friend of mine about electricity meters and I decided to get some...
Feb1-07 08:51 AM
Panda
20 2,958
Does the resistances of each phase in a 3 phase generator add together in the Star (wye)? I read on a windmill site...
Mar9-11 11:24 PM
LotusEffect
1 3,242
I've got a power cord on which I am testing the resistance of the earth wire. I've used 2 different test machines, a...
Oct9-10 11:40 PM
vk6kro
10 1,640
Hi experts, i am wondering if i want to have a few ohms of resistance but does not have any resistor and i use coil...
Mar7-10 07:31 AM
cjameshuff
9 2,005
I am working on air ride system on my Yukon. the computer trouble code says the air exhaust solenoid is bad. I bench...
Nov5-13 09:28 PM
Baluncore
2 576
If a resistor made of a metal is frequently used, will its resistance eventually go down? why?
Feb16-12 07:40 PM
berkeman
3 958
hello, one of my projects is to develop some sort of self heating bottle. i must fabricate and build a working...
Nov27-05 03:03 AM
Ouabache
10 2,086
Hey Guys - Long time reader, first time poster. Im attempting to develop a prototype of a new product. Part of this...
Apr7-13 02:34 PM
clubgitmo
6 867
Hi I'm new here to physicsforums. I have been pondering this for a while since I am into car audio. Would an amp be...
Apr24-06 10:32 AM
Cliff_J
20 8,623
Hi everyone, I wanted to make some tries on PIC programming and needed some circuits. When I was searching I found...
Apr18-13 03:10 PM
Zalajbeg
4 486
Hello, this is my first post on Physics Forums, so if I am making any mistakes, please let me know! My reason for...
Sep29-10 04:34 AM
sophiecentaur
22 5,234
I am trying to get a light in a gauge in my car to become dimmer. How do I go about doing so? I want to keep the...
Mar30-10 08:17 PM
DJM111188
14 1,387
I am constructing a resistive heater that I plan to operate using a standard car battery. Resistance has been...
Jul29-11 04:51 PM
berkeman
7 1,282
Hi i've come across a problem at work and was hoping someone could help me to understand what is going on exactly. ...
Sep11-12 07:30 AM
NascentOxygen
14 1,872
I think it should be possible to use a resistive hybrid to convert from 4-wire to 2-wire, and plug an ordinary...
Oct21-09 10:33 PM
arithmetix
6 1,916
Ok, so here's my scenario/question. I am a technician that works on generators and does load bank testing on them. ...
Oct29-09 03:45 AM
adeel
2 8,557
Hello, I have a question. How do you design a buffered band pass filter with a resistive load of infinity? I...
Jun11-11 10:39 AM
uart
9 1,796
Ok, the coursework i have been give is on the Resistivity of conducting putty. I know that Resistivity is the...
Jan5-05 07:35 AM
silentjay
1 5,181
How do I calculate the resistivity of a doped Si if I have to substrate of the same type. Lets say a P and As doped...
Jan15-14 10:43 AM
analogdesign
1 447
I have a tiny bit of current fluctuation on one of my lines. If i put a lil 500ohm resistor in the line the...
Dec2-09 11:02 PM
Bob S
7 799
I've read of resistors being referred to as four terminal devices, and capacitors being referred to as 3 terminal...
May26-07 05:18 PM
chroot
7 1,708
Hey, So I want to make a program where one can distinguish which resistors are in each loop and then it can solve...
Aug7-10 04:24 PM
darthxepher
0 1,066
This circuit is really confusing me. I'm trying to find i using KVL and KCL. What's throwing me off is the short...
Oct7-12 07:16 PM
BlueSand
3 2,235
In a simple circuit having battery (6v) connected to two resistors (1K each) in series, 3mA would flow through the...
Aug15-12 11:48 AM
sophiecentaur
11 1,523
I have a source of 800 Kilo Ohms and I want to power an LED with that source. Which I would presume the LED would have...
Feb11-11 08:35 PM
Jiggy-Ninja
3 1,444
hey guys I have been given a piece of equipment to fix, that is not charging its battery. I am trying to map out its...
May12-12 05:24 PM
Averagesupernova
2 825
Hi all -- I had a question about the Nyquist-Johnson noise formula: \ which of course can be approximated...
May2-10 01:45 PM
telegraphic
0 986
Hi, i've been struggling to find the answer to this questions, which are probably simple ones. Does it matter what...
May27-14 07:34 AM
sophiecentaur
4 353
http://i.imgur.com/rmnvy.jpg I am trying to repair this device and have determined that the issue is with this...
Feb4-12 02:52 PM
quinnvanorder
22 6,659
Every resistor has some variation with temperature. Let's say I pick a 2K resistor. Is the 2kohm specified at 0 deg C...
Jul5-12 12:44 PM
yungman
1 531
I am working on getting an MSHA approval for a device and I would like to estimate what the surface temperature of a...
Jun26-07 05:38 AM
NoTime
11 4,005

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