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Understanding Resistivity and Conductors in Electrical Systems

Learn how resistivity affects conductivity, resistors, and electric systems. Discover the relationship between resistivity, current density, and resistance in conductors. Explore the use of superconductors in medical scanners and more.

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Understanding Resistivity and Conductors in Electrical Systems

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Presentation Transcript

  1. Can you kill yourself with a 9 volt battery?

  2. Resistivity • Current Density of a conductors depends on Electric Field and the properties of the material • Those properties are symbolized with the Greek letter rho and referred to as resistivity • The unit for resistivity is Ohm-meters • Resistivity changes with temperature

  3. Zero-Resistivity Superconductors Superconductors are used to make medical scanners, magnetometers, and rail guns

  4. Resistivity & Resistance • Unit for Resistance is Ohms (Ω) • Resistance is higher for wires of longer length • Resistance decreases with larger cross-sectional areas

  5. Conductance • The reciprocal of Resistance • Lord Kelvin called the unit the mho • Officially the Siemens • 1 mho = 1 Siemens

  6. Ohm’s Law

  7. Units

  8. I-V Graph for Ohmic Material

  9. Diode: Ohmic or Not Ohmic?

  10. Guess the Resistors!

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