RESISTANCE Flashcards
An electron traveling through
the wires and loads of a circuit
encounters __________
Resistance
is the hindrance to
the flow of charge.
Resistance
is friction in electricity.
Resistance
Factors Affecting Electrical Resistance
Length of Wire
Cross-sectional area of the wire
Kind of Material
The longer the wire, the more resistance that there will
be. There is a direct relationship between the amount of resistance encountered by charge and the length of wire it must traverse.
Length of Wire
The ___________ the wire,
the more resistance that there will
be.
Longer
Wider wires have a greater ____________. The wider
the wire, the less resistance that there will be to the flow of
electric charge.
Cross-sectional area of the
wire
Wider wires have a greater cross-sectional area. The wider
the wire, the __________ resistance that there will be to the flow of electric charge.
Less
Not all materials
are created equal in terms of their
conductive ability. Some materials
are better conductors than others
and offer less resistance to the flow
of charge.
Kind of Material
Not all materials are created equal in terms of their
________________ ability. Some materials are better conductors than others and offer less resistance to the flow of charge.
Conductive
The resistance R of a uniform cylinder of length L , of cross-sectional area A , and made of a material with resistivity 𝝆 , is
R=pL/A
Unit for Resistance
volts per ampere (V/A)
Ohms (Ω)
Ω is he Greek letter capital _________
omega
The resistivity of a metallic conductor nearly always
increases with increasing temperature.
Temperature Dependence of
Resistivity
Resistivity 𝝆 varies with temperature change ∆𝑻 as expressed in the following equation:
p=po (1+a∆T)
