CURRENT ELECTRICITY
In unit 1, we studied
the properties of charges when it is at rest. In reality, the charges are
always moving within the
materials. For example, the
electrons in a copper wire are never at rest and are continuously in random
motion. Therefore it is important to analyse the behaviour of charges when it
is at motion. The motion of charges is called ‘electric current’. Current
electricity is the study of flow of electric charges. It owes its origin to Alessandro
Volta (1745-1827), who invented the electric battery which produced the first
steady flow of electric current. Modern world depends heavily on the use of
electricity. It is used to operate machines, communication systems, electronic
devices, home appliances etc., In this unit, we will study about the electric
current, resistance and related phenomenon in materials.
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