# Advances in Physics by Alan Gladwell

By Alan Gladwell

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As a result, if potential difference is plotted against current on a graph, it will give a straight line with a positive gradient which passes through the origin. The gradient will equal the resistance. In Series Circuits In a series circuit (for example, a row of resistors connected to each other), the resistances of the resistors add up to give the total resistance. Since conductance is the reciprocal of resistance, the reciprocals of the conductances add up to give the reciprocal of the total conductance.

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)? 4. What sort of polymer is a rubber on the end of a pencil? 5. What happens to the translucency of an amorphous polymer when it is put under stress? What is a wave? At this point in the course, it is easy to get bogged down in the complex theories and equations surrounding 'waves'. However, a better understanding of waves can be gained by going back to basics, and explaining what on Earth a wave is in the first place.

The resistances add up, so, in a circuit with two resistors: ΣR = R1 + R2 If we apply Ohm's law, remembering that the current is constant throughout a series circuit: Multiply by current (I): ΣV = V1 + V2 So, just as the resistances in series add up to the total resistance, the potential differences add up to the total potential difference. The ratios between the resistances are equal to the ratios between the potential differences. In other words, we can calculate the potential difference across a resistor using the formula: In many cases, you will be told to assume that the internal resistance of the power source is negligible, meaning that you can take the total potential difference as the EMF of the power source.