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1. Write Ohm's law in symbols, carefully defining each of the variables.

2. Write Ohm's law as a "word equation" expressing a relationship among physical measurements.

3. Discuss what you found in your laboratory about whether all materials obey Ohm's law and show a graph illustrating your results.

4. Discuss the microscopic mechanism responsible for Ohm's law working in a resistor and identify what characteristics of the material the resistor is made of are relevant for determining the current flow in the resistor.

5. If we have a uniform block of material, its mass is dependent on the geometrical properties of the block (its volume) and a property of the material that is independent of the size of the particular bloc (the density). We can then write

(mass) = (density)(volume)

in order to separate those factors.

Consider a cylindrical
resistor of cross sectional area, *A*,
and length,* L*, carrying an electrical current perpendicular
to *A* and
parallel to *L*. Write
a decomposition of the resistance
of the cylinder on the geometrical properties of the resistor (*A* and *L*)
and on other properties of the material that are independent of the size
and shape of the resistor.

Page last modified April 26, 2010: E61