PHYSICS 10 Lecture Notes - Lecture 18: Ferromagnetism, Rare Earth Element, Magnet
8 Nov 2018
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Electricity and magnetism cont: magnet demo, use distribution of iron filings to illustrate lines of the field, show how field can be changed using magnetic materials. I = current @ 110 v: 10 9 w / 100 v = 10 7 a, r = resistance (measured in ohms, heating = i 2 x r = 10 7 a x 0. 5 ohms = . 5 x 10 14 w, same calculation. I = 10 9 w / 10 5 v = 10 4 a. Iv: dissipation = i 2 x r = . 5 x (10 4 a) 2 = 0. 5 x 10 8 w. Edison vs tesla: edison wanted power plants on every corner but too difficult, tesla"s transformer won out. Transformer demo: n p = 50 (reference transformer, starts w/ jacob"s ladder - electrostatic discharge. C: stepping up voltage by going to higher n p = increase current to transport power, for ideal transformer voltage:
