Ohm's Law Triangle (Large) - Page 1
Forum section: electronics / beginners

author: orbiter
author_rank: Frequent Contributor
timestamp: October 24, 2010, 03:07:34 pm
content: Was just looking on the net today at the many Ohm's Law triangles available and thinking.. How come there's not a large one out there so that noobs like myself can print a decent sized one out to stick on the wall? So for me, and people like me.. I made oneJust click the link below to my Mediafire account for the large one...http://www.mediafire.com/i/?xbhcaag51tt8jb4

author: Mechatrommer
author_rank: Super Contributor
timestamp: October 24, 2010, 03:19:57 pm
content: very nice classic. maybe time for a new invention...

author: JohnS_AZ
author_rank: Frequent Contributor
timestamp: October 24, 2010, 03:36:02 pm
content: Guess I'm showing my age, but it's odd to me to see the "V" in the triangle. I always learned it as "E" = IR.And you're leaving out it's sister triangle... P=IE (or, I guess P=IV now-a-days).

author: Zero999
author_rank: Super Contributor
timestamp: October 24, 2010, 04:41:14 pm
content: Here's a better Ohm's law graphic. I admit I use this one. V = IR is easy and so is V = I2/R but I always have to work out the more obscure ones like V = ?(PR)

author: orbiter
author_rank: Frequent Contributor
timestamp: October 24, 2010, 09:21:16 pm
content: Yea I think I saw that one too Hero, I like it. I'll probably do a large version of that too when I get a little more time.

author: Zero999
author_rank: Super Contributor
timestamp: October 24, 2010, 09:40:15 pm
content: Like this?

author: orbiter
author_rank: Frequent Contributor
timestamp: October 24, 2010, 09:48:39 pm
content: I can't see it my friendHave you got a JPEG of it?

author: DJPhil
author_rank: Frequent Contributor
timestamp: October 24, 2010, 10:20:03 pm
content: The ohm's law triangle is what I've had memorized since forever. I think to myself, "E over infrared" in order to remember it. It's goofy, but that's how I have to remember pretty much everything. It's not easy being cheesy.Quote from: orbiter on October 24, 2010, 09:48:39 pmSVG files are great for printing large stuff, as they'll scale happily to any size without distortion. It's a good choice for this job!There'san online converter herefor converting them over, or you can use a program likeIrfanviewwith theproper plugin.Hope that helps.

author: orbiter
author_rank: Frequent Contributor
timestamp: October 24, 2010, 10:46:40 pm
content: Worked a treat.. Thanks DJ

author: scrat
author_rank: Frequent Contributor
timestamp: October 25, 2010, 09:01:32 am
content: If one really needs a triangle to remember Ohm's law...Why not adding the "capacitor's triangle" Q = C * V ? I found it very useful for easily obtaining capacitance behaviour.If you derive it you get I = dQ/dt = C * dV/dt, if you want to know how much it will take to charge a certain capacitor at constant current (like a piece of MOSFET's gate charge) you make T = Q/I = C*V/I....

author: Zero999
author_rank: Super Contributor
timestamp: October 25, 2010, 05:09:32 pm
content: Quote from: orbiter on October 24, 2010, 09:48:39 pmFirstly you don't want to use JPEG for drawing, it's designed for photographs and will smudge line drawings. Use PNG format for drawings like this.Secondly, if you're using any almost browser, except for Internet Explorer, you should be able to open it. If you see a message asking you what program to open it with, select Firefox, Chrome, Opera etc. and it should open up perfectly.Finally, SVG can be read by many drawing programs. I use Inkscape.

author: orbiter
author_rank: Frequent Contributor
timestamp: October 26, 2010, 11:53:49 pm
content: Quote from: Hero999 on October 25, 2010, 05:09:32 pmYea that was a mistake & force of habit I'm affraid as most of the stuff I do in CS5 needs to be saved as either TIFF's or JPEG's, and as I had loads of images ready for a batch process I just lumped my triangle in with themCheers though for poking me with a stick to remind meorb

author: .o:0|O|0:o.
author_rank: Regular Contributor
timestamp: October 27, 2010, 12:19:07 am
content: I never understood the point of the triangle. If you really can't work out that a voltage results from a current passing through a resistor from first principles (say the analogy of pressure for water passing through a partially obstructed hose), then all you need to know is that V=IR, or "VIR", then chances are you know basic maths.I remember when a teacher presented this to the class as some sort of revelation that would make life easier. I thought he was crazy!The problem with the triangle is that you need to know Ohm's Law before you know what it is saying!.o:0|O|0:o.

author: scrat
author_rank: Frequent Contributor
timestamp: October 27, 2010, 09:06:20 am
content: Quote from: .o:0|O|0:o. on October 27, 2010, 12:19:07 amI must agree... Ohm's law is really simple, and I cannot figure out how one can deal with it if he doesn't understand (and then remember automatically) it.

author: orbiter
author_rank: Frequent Contributor
timestamp: October 27, 2010, 10:32:01 am
content: Agreed.. It is really simple, once you know it. The point of the initial picture was for real beginners (I was one not too long ago) and so were you guys (maybe not so long ago) The point of the initial 'larger' image was that anyone interested could just stick it on their wall for a short while just for referance, so that whilst doing their first projects (again like me) It would be easy to quickly check up on.orb

author: Time
author_rank: Frequent Contributor
timestamp: October 27, 2010, 04:46:47 pm
content: I've never seen this visual aid before and I don't really understand why it makes it easier to remember. Its just a relationship that only has 3 variables...Maybe it would be useful to have something for Maxwell's equations... or calculating inductance of solenoids and other things of this nature... but V=IR? Come on!

author: orbiter
author_rank: Frequent Contributor
timestamp: October 27, 2010, 05:40:50 pm
content: Jeez ya try and do something that maybe useful to somebody.

author: Time
author_rank: Frequent Contributor
timestamp: October 27, 2010, 05:45:10 pm
content: Quote from: orbiter on October 27, 2010, 05:40:50 pmHaha sorry, I wasn't trying to bring you down or anything. Sorry for the troll moment.

author: orbiter
author_rank: Frequent Contributor
timestamp: October 27, 2010, 06:03:10 pm
content: Quote from: orbiter on October 27, 2010, 05:40:50 pmNo worries mate

author: Zero999
author_rank: Super Contributor
timestamp: October 28, 2010, 09:33:29 pm
content: I remember condensing all the simple formulae I needed for the whole GCSE science syllabus into three letter combinations like this. Yes, remembering VIR is the answer.