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# pp25 - PHYSICS A World View Thursday 21 April 2005 READ Ch...

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PHYSICS: A World View Thursday, 21 April 2005 READ Ch 21 (pp 446-451) PRAC Ch 21: Q 33, 43, 45, 49, 53 HW #25 Ch 21: Q 28, 32, 38, 48 Tu 26 Apr LAB #21 Batteries and Bulbs II Pre = 1

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QUIZ #3 0 2 4 6 8 1 0 1 2 <2 2 2 4 28 32 3 6 4 0 Ave = 35/40 = 88%
Consider a simple circuit What if we increase the push? more push means more flow What if we change the bulb? not all identical pushes produce identical  flows

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Resistance... Resistance... is futile is futile QuickTime  and a GIF decompressor are needed to see this picture.
Resistance Represents the ability of a circuit element  to impede the flow of current. R =  V element /I element volt/ampere = ohm   Georg S. Ohm (1789-1854) Constant R   ”ohmic” V = I R

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Which has more resistance? steel wood
Which has more resistance? steel steel

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Which has more resistance? steel steel R = ρ L A resistivity
Is the earth a good conductor or a good insulator?

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pp25 - PHYSICS A World View Thursday 21 April 2005 READ Ch...

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