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Discussion for physics P-21 CIE here!

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mr.incredible:

--- Quote from: Bakhtawar on June 11, 2010, 05:21:39 pm ---i did the calculations and stuff... i got power as 120 which is twice the previous value of 60
...not sure though...
lets see what others think..

--- End quote ---

For the power question, it will increase for sure since that it was mentioned that the heater will still operate at the same voltage and also R=pl/A, so the resistance will be halved and since P=V^2/R, with some calculations the new Power will be 4 times the original one. If anyone remembers the original power and length, we can make sure of it again.

leebux101:
i calculated the new length ( half the original) and then calculated resistamce using R=pl/A
and then i think i used P=v2/R
the amswer was 120W which is twice the oroginal value of 60W

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