1.a set of n identical resistors each of resistance R ohm,when connected in series have effective resistance X ohm and when resistors are connected in parallel have effective resistance as Y ohm.Find the relation between R,X&Y.
2. a wire of resistance 10 ohm is bent in the form of a closed circle.what is the effecti ve resistance between 2 points at the ends of any diameter of the circle
3.Define electrical resistivity.how is it related 2 electrical conductivity of the factors length,area of cross-section,nature of material and temperature.which one can control the resistive value of a conductor.
n number of resistances of R,
First connected in series i.e.
Then connected in parallel combination i.e.
Resistance of the wire, R = 10 ohm
Both the resistance are in parallel.
So the equivalent resistance of the wire along the points AB is ,
Conductivity is the measure of the ability of a material to conduct electricity.It is the inverse of resistivity.
Its standard unit is mho /m
Resistivity is the resistance of a unit length with unit area of cross section of the material of the conductor.