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Kaz - Sorry that I can't help much... the only thing I noticed is that unit length in the numerator and denominator of the first formula (R = rho * l/A) is inconsistent. Ie, the area should be converted into square metres since you've changed the length from km to m.
Gee, sorry I'm not much help... let's hope Mirac returns soon to help you out with this. http://www.ironworksforum.com/ubb/no...iles/frown.gif |
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Kaz:
I'm doing Electronic Engineering at Cambridge 1st year: R changes ONLY with material, temperature, length and area. I think http://www.ironworksforum.com/ubb/no...miles/wink.gif I ought to know... Voltage (potential difference) is adjustable and the current THROUGH the resistor changes acoordingly. THE REISITOR can heat up as a result of this... ------------------ <UL TYPE=SQUARE> <LI>Creator and Diamond Bladesinger of ALSB <LI> Body Guard of Lioness <LI>Spam Sentinel <LI>Saint of Ironworks <LI> Winner of EPSRC 2000 Science Website is @ http://www.epsrc-sciencerace.net/schools2000/534121/ <LI> My own Forgotten Realms Website is @ http://www.forgottenrealms.main-page.com[/list] http://www.asnsoup.com/a.jpg |
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Don;t you have Chemestry Questions? I love thise http://www.ironworksforum.com/ubb/no...miles/wink.gif oh wait the question right... Well Kazzy Honey It's quite easy If you higher the voltage and the resistance stays the same What happens? The Amperage highers aswell (the current through the resistor as Avatar calles it) Simple in'it so basicly U/I=l/A (i'm sure that th area ain't A but have no idea what it IS) ------------------ http://www.phpshop.net/images/rikard/rikard2.gif |
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Anyways, Rikard, that is NOT right what you've said about U/I = l/A. Kaz, forget that, not right!! About your problem with the calculations, I did the calculation as well, this is how it should be : rho = 0.017 l = 100 km = 100.000 m A = 0.8 cm2 = 0.008 dm2 = 0.00008 m2 R = rho * l/A R = 0.017 * (100.000/0.00008) = 21250000 ohm This is totally different from the formula U/I = R !!!!! I'll give a an example, try to solve this one : What is R (using R = rho * l/A ) when A = 10 dm2 l = 30 m rho = 0.5 R =???? Solve R With the R you calculated here you go on with this question (using U/I=R is equal (if rewritten) to R*I =U ) : U = ????? I = 5000 mA R = what you calculated in the first question. I'll check in later this day, if you still can't solve it email me. Hope this helps ------------------ http://www.wizardrealm.com/images/angel2.jpg http://www.angelfire.com/rpg2/mirac/...sigs/Done5.gif Lady Menqel, Protector of IW's, smiter of evil http://www.angelfire.com/rpg2/mirac - Priest of Helm - Fellow Table Dancer of the Jerome's Table dancer group - Spell formulater of the IW peace-keeping force - Magical advisor of MiLady Lioness - Thanks to Sazerac for the great sig picture [This message has been edited by Mirac Honorguard (edited 10-22-2001).] |
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------------------ http://home-3.12move.nl/~se021070/dragon2.jpg http://www.ironworksforum.com/ubb/no...iles/hero2.gif Alureth...Dragon friend of Breanna, Mage and Advisor in the Court of Lady Lioness Co-Owner/Operator of the Evil Petting Zoo and devout member of the HADB clan. Commander of the Dragon Fleet, IW Peacekeeping Force Sublime Sister of the Illuminati - may the Light shine forever! Second Historian and Scribe of IW. Mother Hen of IW. Mage extraordinair, Pin-Up Girl for the OLD-COOTS Magey-Wagey: performer in the Nekked Dancing Trio of the ORT. Hopeless Romantic *sigh* |
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Well quoted from Scott Adams's Dilbert Principle..... http://www.ironworksforum.com/ubb/no...les/tongue.gif http://www.ironworksforum.com/ubb/no...les/tongue.gif http://www.ironworksforum.com/ubb/no...les/tongue.gif ------------------ <UL TYPE=SQUARE> <LI>Creator and Diamond Bladesinger of ALSB <LI> Body Guard of Lioness <LI>Spam Sentinel <LI>Saint of Ironworks <LI> Winner of EPSRC 2000 Science Website is @ http://www.epsrc-sciencerace.net/schools2000/534121/ <LI> My own Forgotten Realms Website is @ http://www.forgottenrealms.main-page.com[/list] http://www.asnsoup.com/a.jpg |
AAAAAAAARRRRRRGGGGGG... physics, must run.. and hide.. and... groan... http://www.ironworksforum.com/ubb/no...iles/smile.gif
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Well, I hope you didn't think I was implying that no one else posting here was intelligent. http://www.ironworksforum.com/ubb/no...les/tongue.gif Mirac's post just brought back terrifying memories of Electrical Engineering classes an old b/f of mine was taking, gee, 15 years ago. I would help him with the homework sometimes. *ouch, my brain* ------------------ http://home-3.12move.nl/~se021070/dragon2.jpg http://www.ironworksforum.com/ubb/no...iles/hero2.gif Alureth...Dragon friend of Breanna, Mage and Advisor in the Court of Lady Lioness Co-Owner/Operator of the Evil Petting Zoo and devout member of the HADB clan. Commander of the Dragon Fleet, IW Peacekeeping Force Sublime Sister of the Illuminati - may the Light shine forever! Second Historian and Scribe of IW. Mother Hen of IW. Mage extraordinair, Pin-Up Girl for the OLD-COOTS Magey-Wagey: performer in the Nekked Dancing Trio of the ORT. Hopeless Romantic *sigh* |
I think I can think again today - so if R(cable) = rho * l/A; then R = U/I would be the resistance of the ENTIRE circuit (or whatever it's called in English). Right?
Also got my other physics thing sorted out, with a little help from the teacher. Logical, actually. |
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