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You might have seen sparks on a electric pole when wires become loose. This phenomenon is quite common when a wind is blowing and shaking the wires. You might also have seen sparks when a plug is loose in its socket. Lightning is also an electric spark, but on a huge scale.


Now, of course, we understand that lightning is caused by the accumulation of charges in the clouds.


The science of Electricity had its beginnings in the Greek Civilization. The characteristics of attraction between a Silk cloth (rubbed with glass rod) and amber rods (rubbed with cat's fur) and the repulsion between glass rods, each of which was rubbed with a silk cloth were known to the Greeks. Two types of Electric charges, called positive and negative, are known to exist.

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