PPT2-3: Electrical Resistance and Resistivity / Insulation

• the opposition to current is called

  resistivity
• that the resistance of all wires generally used in practice in electrical systems increases as the temperature is raised
• Inferred absolute temperatures for annealed copper is

  -234.5
• Inferred absolute temperatures for hard drawn copper is

  -242
• Temperature-Resistance Coefficients at 20°C of copper, annealed is:

  0.00393
• Temperature-Resistance Coefficients at 20°C of aluminum is:

  0.0039