Lec 9 | MIT 8.02 Electricity and Magnetism, Spring 2002

Bulb, cold, I think, 25 ohms, and hot, is about 250 ohms. A huge difference. So, if the resistance - if I take the cold resistance, then I would get 5 amps, but by the time that the lamp is hot, I was only half an ampere. It is a huge difference. And what I am going to show, again with the oscilloscope is the current as a function of time. When you switch on a light bulb, one would expect if Ohm's law holds that if you switch on the current - or go to the ...



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