Qualification > Sciences

CIE A level Physics question

(1/1)

mac:
Hi,

Please help with this:

what would be the advantages and disadvantages of resistance and thermocouple thermometers.

Also,
"define and use the concept of specific heat
capacity/latent heat, and identify the main principles of its determination by electrical methods"

Here what are the electrical methods for both the concepts?


thanks

astarmathsandphysics:

--- Quote from: mac on February 24, 2009, 12:53:21 pm ---Hi,

Please help with this:
what would be the advantages and disadvantages of resistance and thermocouple thermometers.
Also,
"define and use the concept of specific heat
capacity/latent heat, and identify the main principles of its determination by electrical methods"
Here what are the electrical methods for both the concepts?
thanks



--- End quote ---
Resistance thermometers need an electric cirduit. You need to measure the voltage and current to find the resistance. For thermocouples tyou need only measure the voltage across a junction.

Specific heat=energy needed to raise the temperature of 1kg of a material by 1K
specific latent heat= amount of heat needed to change 1kg of a substance from state to state at constant temperature.

For specific heat use IVTime=mcTemp and for latent heat use IVTime=ml

where I=current, V=voltage, m=mass, c=specific heat capacity and l=specific latent heat.
Both equations are used for the same circuit which you can find in any AS Level textbook.

iq101:
Hello.

First of all, astarmathsandphysics , your doing something really great by helping students with their problems!

I dont understand the basic functioning of a potentiometer [ at AS level ] and neither can I solve questions related , even though Ive tried all examples! I cant find any textbook which explains it clearly..

Please help !

astarmathsandphysics:
If it is anything to do with exam papers or free text books, everyone here is innocent. As for a potentiometer, you are diviiding a voltage in the ratio of 2 resistance, that is all. use the equation

Navigation

[0] Message Index