how would you obtain this total resistance? - Page 1
Forum section: electronics / beginners

author: little_carlos
author_rank: Regular Contributor
timestamp: March 17, 2016, 12:52:57 am
content: hey, i was solving this simple resistor network to obtain the total resistance, but, i cant obtain the same result as the software says, based on my knowledge it should be 6.32 ohms, idk how the software obtained that valuehere is the picwhich is your result? is it the same as the software? how did you obtained it?thanks for your time

author: Andy Watson
author_rank: Super Contributor
timestamp: March 17, 2016, 01:02:35 am
content: I agree with the software. Note that R1 + R8 gives 5.66\$\Omega\$, therefore the answer must be less.

author: bitseeker
author_rank: Super Contributor
timestamp: March 17, 2016, 01:03:23 am
content: I also get 5.61 ohms.1. R3, R4 and R6 are in series = 8 ohms2. R8 is in parallel with the series resistance #1, above = 8 * 0.66 / (8 + 0.66) = 0.61 ohms3. R1 is in series with the network #1, #2 = 5 + 0.61 = 5.61 ohms

author: little_carlos
author_rank: Regular Contributor
timestamp: March 17, 2016, 01:06:45 am
content: Quote from: bitseeker on March 17, 2016, 01:03:23 amlool thanks, i noticed i didnt put the parentesis on the calculator, lol im an asholebut the steps i did were right, thanks again

author: Vgkid
author_rank: Super Contributor
timestamp: March 17, 2016, 01:08:22 am
content: I have 5.59ohms so good enough.you guys are fast with your responses. I could explain it faster than i could calc it.

author: bitseeker
author_rank: Super Contributor
timestamp: March 17, 2016, 01:13:15 am
content: Quote from: little_carlos on March 17, 2016, 01:06:45 amAh, yes. Ensuring the correct order of operations is important.Even better, do the addition part in your head.

author: Brumby
author_rank: Unknown
timestamp: March 17, 2016, 02:22:51 am
content: Quote from: Andy Watson on March 17, 2016, 01:02:35 am... That was my very first observation - and one of several valuable 'estimation' processes to give you an idea of where the answer should be. Blind trust in calculations is risky without an independent means to support the given answer.Also came up with 5.61\$\Omega\$

author: bson
author_rank: Unknown
timestamp: March 17, 2016, 05:26:08 pm
content: ((R6+R3+R4)||R8)+R1=5.61ohm

author: xygor
author_rank: Regular Contributor
timestamp: March 17, 2016, 08:34:37 pm
content: Ok, I gotta ask: What are you people looking at!? I can't read the resistor values in the OP drawing. Do I have a browser issue?

author: Ian.M
author_rank: Super Contributor
timestamp: March 17, 2016, 08:41:29 pm
content: Browser issue, insufficient screen resolution, or you need to go to an optician.

author: Vgkid
author_rank: Super Contributor
timestamp: March 17, 2016, 08:44:31 pm
content: Quote from: xygor on March 17, 2016, 08:34:37 pmLooks like the image host provider shrunk/dropped the quality of the image. Even after downloading , it is still blurry.

author: Ian.M
author_rank: Super Contributor
timestamp: March 17, 2016, 09:07:24 pm
content: Pin-sharp here and I've just checked it in another browser to confirm I'm not seeing a locally cached copy.Even though this forum tells your browser to resize large images to fit the column width, the resistor values and 'multimeter' are readable as is with a 1024px screenwidth. The jpeg itsself opened in a new window is 1278x719px and is fully readable, right down to the clock on the O.P.'s windows taskbar.However for anyone contemplating posting something similar (i.e. any line drawing or diagram), *PLEASE* crop irrelevant crud from the edges, reduce the colour depth to 256 or even 16 colours and save as GIF or PNG. That gets you the most bang from your filesize limit buck if the original is *NOT* a photo. JPEGs with medium to high compression blur fine detail so should be avoided for line art. If you don't have anything better to do it in, grab a copy of IrfanView, which also has a very handy RIOT plugin for crunching JPEGs just enough to squeek through any specific file size limits.

author: bson
author_rank: Unknown
timestamp: March 18, 2016, 12:36:01 am
content: Yeah, perfectly clear and readable here too...