燈泡光強度會否隨著交流電轉變？
回答 (2)
2010-04-10 8:54 am
✔ 最佳答案
Yes, it is true for a filament light bulb. The brightness of the bulb changes with the time variation of the current passing through it. For domestic ac power in the form of a sinusoidal variation of 50Hz frequency, the bulb indeed flashes at 100 times in 1 second.
2010-04-11 8:34 am
the change of the voltage in live wire is from -220V to 220V with 50Hz sinusoidal wave,it mean the voltage which live higher than neutral and neutral higher than live have 100 revolutions altogether.
when the voltage of live change to 150V,the brightness of the bulb must brighter than the voltage of live is 50V,sine its a sinusoidal wave.
when the voltage of live change to 150V,the brightness of the bulb must brighter than the voltage of live is 50V,sine its a sinusoidal wave.
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