By Alan Gladwell
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Additional resources for Advances in Physics
As a formula: V = IR In terms of Resistance where V = potential difference (V), I = current (A) and R = resistance (Ω). This formula can be rearranged to give a formula which can be used to calculate the resistance of an artefact: In terms of Conductance Since conductance is the reciprocal of resistance, we can deduce a formula for conductance (G): The Relationship between Potential Difference and Current From Ohm's Law, we can see that potential difference is directly proportional to current, provided resistance is constant.
This means that polymers are poor conductors. Boiling Point Polymers do not have boiling points. This is because, before they reach a theoretical boiling point, polymers decompose. Polymers do not have melting points for the same reason. Questions 1. Different crystalline structures have different refractive indexes. Why does this mean that a polycrystalline polymer is translucent? 2. What sort of polymer is a pane of perspex? 3. What sort of polymer does the pane of perspex become when shattered (but still in one piece)?
This effect is called plasticity. Elasticity When a metal is stretched, it can return to its original shape because the sea of electrons which bonds the ions together can be stretched as well. Questions 1. Would you expect a metal to have more or less conductivity than a semiconductor? Why? 2. How can the stress-strain graph for a metal be explained in terms of ions in a sea of electrons? 3. As a metal heats up, what happens to its conductivity? Why? Polymers A simple polymer consists of a long chain of monomers (components of molecules) joined by covalent bonds.
Advances in Physics by Alan Gladwell