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110 V Incandescent Lamp Plugged to a 220 V Gri (Q045E)



“Can I connect a 60W to 110V lamp in the 220V grid by placing a diode in series (1N4007?). It will only let half the half-cycles of the power supply pass through and the average voltage will be 110 V!”


Theoretically it works if it was not a but. The moment you turn on the lamp the filament will be cold and with it its very low resistance. Thus, even with only half the half-cycles, the initial current will be much higher than expected with 110 V and this may cause the lamp to burn immediately. If it survives this initial impact, it can function normally ...