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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 5,521
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 6,682
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Mar26-08 12:32 PM
berkeman
0 30,079
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 87,968
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 56,014
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 78,166
Can someone elaborate on E.E research topics and current-active research programs? I have read about photonics,...
Aug24-13 02:26 PM
Akaisora
3 766
Hi, ( im not sure where to put this) Ive been researching about potentiostats, and I cant seem to grasp the purpose...
Mar30-07 07:53 PM
hellothere
0 1,107
I have an outdoor light that doesn't work because the contractor did not correctly wire up neutral line. The hot and...
Sep22-09 11:48 AM
david90
3 1,241
I am having my home evaluated by a SunRun, Home Depot and bpsolar consortium. There was a booth in a Home Depot store...
Sep27-11 05:17 PM
mheslep
29 3,782
Have always wondered this so maybe I can get an answer here: when a large industrial electromagnet is switched off and...
Jul16-09 12:19 PM
bobbobwhite
3 1,530
Design of heating element: Supply Voltage: 220V/3Ph/60HZ, Power: 9KW Resistance= VXV/P= 220X220/9000= 5.4 Ohms,...
Mar29-10 04:07 PM
Phrak
3 2,444
i have a question and i will be glad if anyone could help you know if a current flow in resistance , a power is...
Feb27-09 05:14 PM
Naty1
2 1,322
Please explain the below: Resistance@95 =R@35 x (1+α*(95x(I/Io)+20))/(1+75x α) at the actual current A (I Act).
Jul20-14 04:11 AM
bibincjoy
10 793
Hi Im a Mechanical engineer but Im taking a module in electrical, which isnt my strong point. Please can someone...
Dec8-06 05:37 AM
SGT
3 1,157
Imagine for a moment that there is a box filled with some resistive gas. You are holding two probes a distance of X...
Jul12-11 03:55 PM
berkeman
9 1,906
hi all, I'm looking for a cheap (and by extension simple) circuit. i have a special pot (Piher's 10mm hex PT-10)...
Dec3-11 02:19 AM
vk6kro
5 1,253
So I've made a circuit that lights up a light bulb whenever it's dark. I did this using a photoresistor and it is...
Nov29-11 08:19 AM
samski
1 1,192
Hello, I had to measure the resistance between different sets of bridge deck reinforcement steel bars using a...
Sep3-11 08:09 PM
jim hardy
8 1,133
Recently, I made a laptop cooler using an old CPU fan (rated 12V, 0.37A) I removed from a desktop. The cooler was...
Jul20-11 05:26 AM
davenn
3 1,518
A non Ohmic relation of current and voltage is I=α(exp(eV/kT)-1). Where α,K,T,e are constant. What will be the...
Mar31-12 02:36 AM
Mitadru Banik
5 1,339
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 2,204
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 5,007
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 3,084
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 32,593
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 1,950
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 1,766
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
3 694
There are different levels of earthing pits. Like transmission stations, local substations, etc. Can someone specify...
Jul6-09 05:58 AM
i.mehrzad
2 5,971
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 1,856
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 2,962
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 3,251
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 1,641
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 2,023
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
2 579
If a resistor made of a metal is frequently used, will its resistance eventually go down? why?
Feb16-12 07:40 PM
berkeman
3 959
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 2,088
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
6 874
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 8,838
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
4 488
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 5,249
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 1,391
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 1,284
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 1,885
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 1,917
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 8,576

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