Question

The graph between V and I for a conductor is a straight line
passing through the origin.
a. Which law is illustrated by such a graph? What should
remain constant in the statement of this law?
b. Two wires A and B are made of silver. The wire A is long
and thin while the wire B is short and thick. Which will have
more specific resistance? Name one factor on which the
specific resistance of the wire depends.
c. Write the difference between short circuiting and
overloading.

Answer 1

Answer:

From the graph, slope of wire A is greater slope =

dx

dy

=VIR=VI= slope

Hence wire A has greater resistance. The heat produced by resistor is given by P=I

2

.RT. It is directly proportional to square of current paring through it resistance and time for which the current passes through the conductor. Hence A wire is made of a material of high resistivity.