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## Ohm's Law and You

 To: mgs@autox.team.net Ohm's Law and You Ted Weiler Tue, 18 Jun 1996 08:52:13 -0700
 ```At last, something I can talk about. There has been some conversation here about current through lamps increasing as the voltage decreases because the lamp is rated at a particular wattage and Ohm's law was used (abused) to show that this was true. However, that isn't quite the way it works. The wattage rating on a lamp is an indication of the maximum wattage it will deal with without releasing excess smoke. A lamp can be thought of as a constant resistance device. That means that no matter how much smoke you force through it, the resistance remains essentially the same. It will, in fact, change as the filament heats up but that is inconsequential here. Wattage is calculated by Volts X Amps. Since the lamp is a fixed resistance, you find out how much current will flow through it by respecting Ohm's law V= I X R or I = V/R. Therefore, as the voltage drops so does the current. As they both drop, so does the wattage. If the voltage increases so does the current. If you increase the voltage too much, you will have to much wattage and exceed the rating for the bulb and the filament will break and spill smoke all over the inside of the bulb which will keep any more light from coming out of it. I hope that this helps to clarify the situation. If more is needed, or wanted, I will be happy to hold forth at great length on this and related topics on the study of smoke. Ted Edward B. (Ted) Weiler, tweiler@eskimo.com Engineering Manager, Olympic Medical Director, Volunteers NorthWest http://www.eskimo.com/~tweiler/vnw.html Membership, MG Car Club NorthWest Centre http://www.eskimo.com/~tweiler/mgccnwc.html ```
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