The resistance R of a conductor does not depend on

The correct answer is Pressure.

Key Points

• The resistance (R) of a conductor primarily depends on its material. Different materials have different resistivities.
• The resistance is influenced by the dimensions of the conductor, specifically its length (L) and cross-sectional area (A).
• Temperature also affects resistance; for most conductors, resistance increases with temperature.
• Resistance does not depend on the potential difference (voltage) applied across the conductor.
• Pressure typically does not have a significant effect on the resistance of a conductor.

Additional Information

• Ohm’s Law
  • Ohm's Law states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points.
  • The formula is V = IR, where V is the voltage, I is the current, and R is the resistance.
• Resistivity
  • Resistivity is a material property that indicates how much the material opposes the flow of electric current.
  • It is denoted by the Greek letter ρ (rho) and has units of ohm-meter (Ω·m).
• Factors Affecting Resistance
  • Material of the conductor: Different materials have different inherent resistivities.
  • Length of the conductor: Resistance increases with the length of the conductor.
  • Cross-sectional area: Resistance decreases with an increase in the cross-sectional area of the conductor.
  • Temperature: For most materials, resistance increases with an increase in temperature.
• Superconductors
  • Superconductors are materials that can conduct electricity without resistance below a certain temperature.
  • This critical temperature varies for different materials and can be very low.