on what factor resistance of conductor depends
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★★Conductor resistance ★★
is a property of a conductor at a specific temperature, and it is defined as the amount of opposition there is to the flow of electric current through a conducting medium.The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.
The resistance of a conductor can be calculated at a temperature of 20°C using:
★★ R=ρLA R=ρLA
where:
★RR is the resistance, in ohms (Ω)
★ρρ is the resistivity of the material in ohm meters (Ωm)
★LL is the length of the conductor in meters (m)
★AA is the cross-sectional area of the conductor in meters squared (m2)
This formula tells us that the resistance of the
conductor is directly proportional to ρρ and LL,
and inversely proportional to AA. Since the
resistance of some conductor, such as a piece
of wire, depends on collisions within the wire
itself, the resistance depends on temperature.
With increasing temperature, the resistance of
the wire increases as collisions within the wire
increase and "slow" the flow of current. The
amount of change is determined by
the temperature coefficient.A positive temperature coefficient results in resistance
increasing with temperature whereas a
negative temperature coefficient results in a
decreasing resistance with an increasing
temperature. Since conductors typically
display an increased resistivity with
temperature increase, they have a positive
temperature coefficient. The most common
types of resistors are variable resistors and
fixed resistors.
is a property of a conductor at a specific temperature, and it is defined as the amount of opposition there is to the flow of electric current through a conducting medium.The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.
The resistance of a conductor can be calculated at a temperature of 20°C using:
★★ R=ρLA R=ρLA
where:
★RR is the resistance, in ohms (Ω)
★ρρ is the resistivity of the material in ohm meters (Ωm)
★LL is the length of the conductor in meters (m)
★AA is the cross-sectional area of the conductor in meters squared (m2)
This formula tells us that the resistance of the
conductor is directly proportional to ρρ and LL,
and inversely proportional to AA. Since the
resistance of some conductor, such as a piece
of wire, depends on collisions within the wire
itself, the resistance depends on temperature.
With increasing temperature, the resistance of
the wire increases as collisions within the wire
increase and "slow" the flow of current. The
amount of change is determined by
the temperature coefficient.A positive temperature coefficient results in resistance
increasing with temperature whereas a
negative temperature coefficient results in a
decreasing resistance with an increasing
temperature. Since conductors typically
display an increased resistivity with
temperature increase, they have a positive
temperature coefficient. The most common
types of resistors are variable resistors and
fixed resistors.
Answered by
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Answer:
The resistance of a conductor depends on the cross sectional area of the conductor, the length of the conductor, and its resistivity. It is important to note that electrical conductivity and resistivity are inversely proportional, meaning that the more conductive something is the less resistive it is.....
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