# Physics OCR, shc!

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#1
Define Specific Heat capacity, and show an awareness of the principle of its determination by an electrical method.

Anyone know what this electrical method is? Just to hopefully point me in the right direction?
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17 years ago
#2
(Original post by misty)
Define Specific Heat capacity, and show an awareness of the principle of its determination by an electrical method.

Anyone know what this electrical method is? Just to hopefully point me in the right direction?
presumably the electrical method would be to stick a heating element (usually a rod of some sort) into a known mass m of copper (or another suitable metal), driving a constant current I through it at a constant potential difference V for a certain time t, measuring the difference in temperature T for the copper. the energy supplied to the copper E = IVt. by the SHC formula, E=mCT, so IVt=mCT => C = IVt/mT
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17 years ago
#3
(Original post by misty)
Define Specific Heat capacity, and show an awareness of the principle of its determination by an electrical method.

Anyone know what this electrical method is? Just to hopefully point me in the right direction?
S.H.C. is the energy change when 1 kg of substance has its temperature raised by 1 K. It's symbol is c units are J K^-1 Kg^-1.

According to the first law of thermodynamics: heat lost = heat gained,

so: Electrical work = Heat gained by substance

therefore: IVt = mc(delta theta)
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17 years ago
#4
(Original post by GeneralGrievous)
presumably the electrical method would be to stick a heating element (usually a rod of some sort) into a known mass m of copper (or another suitable metal), driving a constant current I through it at a constant potential difference V for a certain time t, measuring the difference in temperature T for the copper. the energy supplied to the copper E = IVt. by the SHC formula, E=mCT, so IVt=mCT => C = IVt/mT
i did this for coursework at A2 and got very good in it, if you need any of my coursework i'll quite happily send it to you
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17 years ago
#5
( To Misty )
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17 years ago
#6
Hey if u GuyS n gAlz need soome help with Any questions i know a good webpage WhiCh will create programs for u which can Be created however u want, all you have to do is email what you need. there are samples on it.

www.geocities.com/softpro101
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