There is a 220 volt 100 watt incandescent bulb, if it is connected to 110 volt supply voltage, how much power does it actually consume

According to P = u & # 178; / R, the resistance of the bulb remains unchanged. The power of the bulb is directly proportional to the square of the voltage, and the voltage is reduced from 220 V to half (1 / 2), that is, 110 V, then the power becomes the original (1 / 2) &# 178;, that is, one fourth, so it is 100 / 4 = 25 W
Similarly: the voltage drop is 1 / N of the original power, and the power drop is 1 / N of the original power

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