A100w lamp is designed for use with 110v ac, what is the resistance of its filament ?
AS physics homework = fail
P = V^2/R ==> R = V^2/P = 121 ohms. Note that this is the hot resistance. Because of the great temperature change the filament goes through, its cold resistance will be much less.
My Lister AK Driving my 110v Dynamo Powering my 110v Lamp
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