Resistivity (ho) is a material's intrinsic property that quantifies how strongly it resists the flow of electric current.
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Define resistivity.
Resistivity ($
ho$) is a material's intrinsic property that quantifies how strongly it resists the flow of electric current.
What is the unit of resistivity?
Ohm-meters ($Omega cdot m$)
Define resistance.
Resistance (R) is the opposition that a substance offers to the flow of electric current.
What is the relationship between resistivity and resistance?
Resistance depends on a material's resistivity, length, and cross-sectional area.
What characterizes a good conductor in terms of resistivity?
Good conductors have low resistivity, allowing current to flow easily.
What characterizes a good insulator in terms of resistivity?
Good insulators have high resistivity, hindering current flow.
What is resistivity ($
ho$)?
Resistivity ($
ho$) is a material's intrinsic property that quantifies how strongly it resists the flow of electric current.
Define resistance (R).
Resistance (R) is the measure of the opposition to current flow in an electrical circuit. It is measured in ohms ((Omega)).
What is cross-sectional area (A)?
Cross-sectional area (A) is the area of a two-dimensional shape that is obtained by slicing through an object perpendicular to a specified axis. It is measured in square meters ((m^2)).
Define length (L) in the context of resistivity.
Length (L) is the distance between two points along a conductor through which current flows. It is measured in meters (m).
What are conductors?
Conductors are materials with low resistivity, allowing electric current to flow easily through them.
What are insulators?
Insulators are materials with high resistivity, hindering the flow of electric current.
What is the effect of increasing temperature on resistivity (generally)?
Generally, as temperature increases, resistivity also increases.
What is the effect of increasing temperature on resistance (generally)?
Generally, as temperature increases, resistance also increases.
What is the effect of increasing the length of a wire on its resistance?
Increasing the length of a wire increases its resistance.
What is the effect of increasing the cross-sectional area of a wire on its resistance?
Increasing the cross-sectional area of a wire decreases its resistance.
What is the effect of changing the shape of a material on its resistivity?
Changing the shape of a material does not affect its resistivity.
What is the effect of decreasing current with constant voltage on resistance?
Since V is constant and I decreases, the resistance R must increase (R = V/I).