Quote:
Originally posted by Kaz:
I am writing a Physics test on Thursday, and am kind of stuck on this point.
We are doing (among others) high voltage cables and why we use them. Now, I have a question. The resistance of the cables would be Resistance = rho * length/area (R=rho * l/A), rho being the resistance factor of the material. Now, you also calculate the resistance by Resistance = Voltage/Amperage (R = U/I). However, of course, if you change the voltage the resistance of the cables would change, but that is impossible because they are a fixed length, area and material! HELP!!! What changes? What IS the resistance I got in the second computation?
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Whoohooo Physics
Don;t you have Chemestry Questions?
I love thise
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)
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