Physics Plan Exercise. Please Help!

[klinx69]

Im currently researching for a physics plan about resistance of bricks and unsure on a few things and would like some opinions please.

we have to make a current flow through the two end faces of the brick, I was thinking of drilling two small holes in the very centre and flowing the current through here? Or could you cover the end with tin foil and let it flow through this?

the other problem is measuring the brick from a temperature of 20 degrees c to 800 degrees c. does anyone know of any equipment that can do this?

many thanks

[brachiopod]

Christ, this is getting as wearisome as "tuck your blanks into your blanks".

Are you at the same school / college as AngloScot and d694 ?

Deliver the current to the brick by whatsoever means you think suitable - aslong as you keep to that method throughout your resistance measurements, then your results should be valid.

Do you have to measure absolute resistance, or % change in R with Temperature? In other words, the measured conductivity will vary between the 'foil-coverd-end' method and the 'drill-a-hole' method, but the derived variance of R with temperature should be the same in % terms.

As for the temperature problem, does your science department have a refractory oven? Or your art/ceramics department may have a kiln.

(Don't forget to dry out your brick by prolonged High-T� heating before you start measuring resistance at any temperature - water absorbancy will radically alter any resistance readings you get.  Even Class A engineering bricks can have up to 4.5% water absorption, and although being Category S2 for soluble salts content, they provide a great electrolytic potential to mess up your results!)

[Thunderchild]

this is getting crazy i have already answered this question twice and think it is time the three of u club together and try and work it out. in my past posts i explained thoroughly but suggest u visit your school or town library and do a bit of searcing urselves u could all poll ur info and make a strt from there but up to now we at AB have had few details about this crazy experiment and little initiative on ur parts.