Chapter 19-2: Pages Physics

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Presentation transcript:

Chapter 19-2: Pages 700-707 Physics Resistance Chapter 19-2: Pages 700-707 Physics

“Resistance IS FUTILE!!!” So sayeth the Borg!

Resistance I. Resistance – the ratio of the potential difference across a conductor to the current it carries R = ΔV → potential difference I → current

Resistance Resistance is measured in ohms (Ω)  1 Ω = 1 Volt / Amp Ohm’s law – the resistance is constant over a wide range of applied potential difference ΔV / I = constant

Resistance *Ohm’s law does not hold true for all materials - Materials that have a constant resistance over a wide range of potential differences are said to be ohmic. - Materials that do not function according to ohm’s law are said to be non-ohmic *Diodes are common non-ohmic devices

Resistance - Resistance depends on length, cross-sectional area, material, and temperature - Salt water and perspiration lower the body’s resistance.

Resistance - Superconductors have no resistance below a critical temperature - Superconductor – a material whose resistance is zero at or below some critical temperature which varies with each material

Homework: P. 703 #1-5 P. 707 #1, 2, 4, 5, 7 Make it so. Engage!

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