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Questions and Answers
What is the physical significance of the resistivity of a material, and how does it relate to the flow of electric current?
What is the physical significance of the resistivity of a material, and how does it relate to the flow of electric current?
The resistivity of a material is a measure of how strongly it opposes the flow of electric current, and a low resistivity indicates a material that readily allows the movement of electrical charge.
What is the relationship between the resistivity and conductivity of a material, and how are they related in terms of units?
What is the relationship between the resistivity and conductivity of a material, and how are they related in terms of units?
The conductivity of a material is the reciprocal of its resistivity, and the unit of conductivity is the reciprocal of the unit of resistivity, i.e., ohm-1 meter-1 (Ω -1.m -1 ).
Explain the significance of the equation R = ρe l / A in understanding the factors that affect the electric resistance of a conductor.
Explain the significance of the equation R = ρe l / A in understanding the factors that affect the electric resistance of a conductor.
The equation R = ρe l / A shows that the electric resistance of a conductor is directly proportional to its resistivity, length, and inversely proportional to its cross-sectional area, highlighting the importance of these factors in determining the resistance.
What is the SI unit of electrical resistivity, and how does it relate to the measurement of resistance in a conductor?
What is the SI unit of electrical resistivity, and how does it relate to the measurement of resistance in a conductor?
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How does the resistivity of a material depend on its properties and temperature, and what are the implications for its electrical behavior?
How does the resistivity of a material depend on its properties and temperature, and what are the implications for its electrical behavior?
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Study Notes
Factors Affecting Electric Resistance
- Electric resistance (R) is directly proportional to the length of the conductor (l) and inversely proportional to the cross-sectional area of the conductor (A).
- The formula for electric resistance is R = ρe l / A, where ρe is the resistivity of the conductor.
Electric Resistivity (Specific Resistance)
- Electric resistivity (ρe) is the resistance of a conductor of length 1m and cross-sectional area 1m2 at constant temperature.
- It measures how strongly a material opposes the flow of electric current.
- A low resistivity indicates a material that readily allows the movement of electrical charge.
- The SI unit of electrical resistivity is the ohm-meter (Ω.m).
Electric Conductivity
- Electric conductivity (σe) is the reciprocal of the resistivity (σ = 1/ρ).
- It is a measure of how easily electric current can flow through a material.
- The unit of electrical conductivity is ohm-1 meter-1 (Ω-1.m-1).
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Description
Learn about the factors that affect the electric resistance of a conductor, including its length, cross-sectional area, and resistivity. Understand the concept of resistivity and how it measures a material's opposition to electric current flow.
