2. Resistance is the opposition that a substance offers to the flow of
electric current.
Unit of resistance is ohms .
V = IR
V= VOLTAGE
I =CURRENT
R =RESISTANCE
If we increase resistance then current decrease.
3. Specific resistance is defined as the electrical
resistance offered by unit length and unit cross area
section of a material when a known voltage is applied
at its ends. Its unit is ohm m.
SPECIFIC RESISTANCE
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4. PRINCIPLE OF SPECIFIC RESISTANCE
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Resistance is directly propotional to length
and inversaly propotional to cross sectional
area
5. ADVANTAGES
Specific resistance is material inheritance
property .
Specific resistance is a constant entity. Its
value remains constant for every
individual substance.
6. To measure small resistances is to use a four-wire
Kelvin connection with an ohm-meter designed for
this. This can be most closely emulated by using the
ammeter before the wire under test and voltmeter
combination.
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DISADVANTAGES OF SPECIFIC RESISTANCE
7. APPLICATION OF SPECIFIC RESISTANCE
Temperature detector
To find the specific resistance of meter
bridge
8. Example 1 :-Resistance of material is 12 Ω,
length is 10m,and area of material is 44m2 Find
the resistivity?
Ans:-Given:-
Resistance= 12 Ω
Length=10m
Area=44m2
Resistivity=?
Resistance = Resistivity*Length/Area
12 Ω=resistivity*10m/44m2
Resistivity= 12*44/10
=52.8 Ω.m
9. QUE1:-Resistance of material is 12 Ω,
length is 10m,and area of material is 44m2
Find the resistivity?
QUE2:-length of material is 12m, resistance is
10Ω,and area of material is 44m2 Find the
resistivity?
QUE3:-Area of material is 12m2, resistance is
10,and length of material is 13m Find the
resistivity?
