Question

THE RESISTORS ARE GENERALLY MADE OF THIN WIRES OF EUREKA OR MAGANIN WHILE THE WIRES USED IN CONNECTIONS ARE MADE COMPARTIVELY THICKER AND ARE OF COPPER OR ALUMINIUM.WHY?GIVE REASON.

Answer 1

The wires should have zero or very less resistance. Copper and Aluminium has a high conductivity and the thickness is inversely proportional to the resistance. So a thick Copper or Aluminium wire is used for connections.
On the other hand, resistors must have a considerable and fixed resistance. It should not change very much with temperature. Eureka has this property. One has to know the resistivity of the material then calculate perfectly the length and thickness of the wire to get the desired resistance. The resistors are made of thin wires to give them the desired high resistance.