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The electromotive force or emf of a cell in a circuit is, for a start, not a force at all: it has the unit of volts. A good definition is ‘the power supplied by the cell per unit current through the ce...

When do you use n choose k?

Say you have n objects/elements, and each one can either be selected or not selected. ‘n choose k’ gives yo...

The evolution of heat from a reaction is often classified as being exothermic or endothermic, but how do you know which one it is in order to assign the appropriate sign?

 A simple way to...

Most people are tempted to start with a quote; I would strongly advise against it. You only have a certain amount of space to spend discussing literature, so start off immediately by talking about it, str...

Remember you have only 90 minutes to get through the ELAT, and structure accordingly. Be familiar with your strengths beforehand: are you more comfortable analysing prose or poetry? Spending too long maki...