Qualification > Revison Notes

CIE AS PHYSICS PAPER 1 (OCT/NOV)

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Tyserius:
It's actually pretty simple.. Haha. Well you do know that Power = RI^2. So the percentage uncertainty for Power would be = Percentage Uncertainty of R + 2 ( Percentage Uncertainty of I ) << Because it is I^2 meaning I x I. You would get 2% + 2 (2%) = 6% which is C :)

P.S : If you wanna know how to derive the formula for percentage uncertainty, lemme know :)

MaNi_DaDuDe:

--- Quote from: Tyserius on November 13, 2009, 06:53:00 am ---It's actually pretty simple.. Haha. Well you do know that Power = RI^2. So the percentage uncertainty for Power would be = Percentage Uncertainty of R + 2 ( Percentage Uncertainty of I ) << Because it is I^2 meaning I x I. You would get 2% + 2 (2%) = 6% which is C :)

P.S : If you wanna know how to derive the formula for percentage uncertainty, lemme know :)

--- End quote ---

Yep.

Multiplying or dividing unc --> add

jademax:
ahh i see now.. thanks alot mate
This is wat i did:
P=I^2R but then i said 2(0.05/2.50)+0.02/4.7 =0.04

then 0.04*100=4%

jademax:
how do u get 2% as uncertainty for I?

Could u pls show me step by step

falafail:
well that was simple ._.

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