Why are electrical wires covered with insulators in our house hold wirings?
Why do we need electrical switch in a circuit? Draw its symbol.
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1.Most electrical wire is covered in a rubber or plastic coating called insulation. ... The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.
2.It is very convenient to represent various electrical components (such as a cell, battery, bulb, switch and connecting wires) by symbols.By using these symbols, electric circuits can be represented conveniently by drawing their circuit diagrams.
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