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Answered 2010-11-29 14:41:52
A 60 watt incandescent bulb using 120 Volts draws about one-half amp.
Watts = Volts x Amps (For a resistive load).
By Ohm's Law Volts = Current x Resistance so R = 120 V / .5 A = 240 Ohms.
Doing the same math for a 40 watt bulb you get 360 Ohms.
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