PART A)
Conductivity of insulator is very small as there is no free electrons to conduct the current trough that medium
So here number of conduction electrons are very less in insulators
PART B)
Resistance is the property of a conducting medium which will oppose the flow of current trough it
Resistance of wire directly depends on its length so resistance of long wire will be more than the resistance of short wire
Resistance inversely depends on the area so if a wire has more crossectional area then its resistance must be small
PART C)
power of light bulb is defined as rate of electrical energy
it is given by formula
P = i V
here we know that
i = 1.46 A
V = 120 volts
so power is given as
[tex]P = 1.46 \times 120[/tex]
[tex]P = 175.2 Watt[/tex]
a) Conductivity originates from the word "conduct" and is being used when talking about how good (high conductivity) or how bad (low conductivity) materials allow charge carriers (electrons in metals) pass through the material. Insulator must isolate things, i.e. it must not have free electrons or electrons with weak ties that can make current.
b) Resistance lessens currents. Resistance is like a tube: water passes through short and wide tube easily and the current hardly passes through a long and thin tube.
c) P=IV=1.46*120=175.2 W.
