Copper Bar
Copper Bar
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Investing in Copper - Bars vs. US Cents
When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip.?
What is the reason for this?
A) copper expands more than iron.
B) iron expands more than copper.
A. Copper's thermal expansion coefficient is more than Iron's.
See
http://en.wikipedia.org/wiki/Coefficient_of_thermal_expansion#Thermal_expansion_coefficients_for_various_materials
how many amps can a square inch of copper bar carry at any temperature rise?
It will depend on the type of insulation. A naked copper bar can carry huge amounts of current, and even turn red hot. If it runs too hot it will oxidize after a while.
The amount of amps will depend on the resistance and voltage applied. Use ohm's law and the copper resistivity eqn. to find out exactly how much.
The temperature rise will depend on the ambient temperature and the type of cooling, i.e., natural or forced air flow.
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