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Physics Notes 10-29-07

Physics Notes 10-29-07 - (25-n(9 W/120 V n(10.4 W/120 V<...

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Physics Notes 10-29-07 NOTE: Test: November 14 th **Chapters 7, 16-19** (Collisions, Circuits, Electric Fields, Magnetism) Power Problem: (2 nd Frame of Today’s Slideshow) a) P = V 2 /R R= V 2 /P R = (120 V) 2 /9 W R= 1600 Ohms b)V=IR I=V/R I= 120 V / 1600 Ohms I = .075 A c) I Total = I 1 + 1 2 + … + I n I total = 25(.075) I total = 1.9 A d) n= # of 10.4 W bulbs 25-n = # of 9 W bulbs
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Unformatted text preview: (25-n)(9 W/120 V) + n(10.4 W)/120 V < 2A n= 10.7 bulbs…10 bulbs!-If you heat a permanent magnet above some critical temperature that depends on the properties of the magnet, then it is no longer magnetic.-The above is a phase transition-No magnetic monopole(isolated magnetic charge)!!!!!!!!...
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