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If AC means alternating current used to light up a bulb and alternating current moves up and down then why does light emitted from that bulb not alter to give us first a low light then a bright light?
Wiki User
∙ 11y ago
Electric light bulbs use electric current to heat a filament to high temperature which produces electromagnetic radiation which appears to us as as "heat" in the invisible part of the frequency spectrum and "light" in the visible part. The alternating current (AC) voltage waveform changes at a frequency of 50 or 60Hz (cycles per second of a sine wave) depending on which country you live in. The filament stays heated from cycle to cycle of the AC voltage waveform - the highs and lows of the AC waveform are so close that the filament does not have time to cool off much. It thus seems to emit light continuously for us and we don't notice any reduction in light. One reason contributing to this is the persistence in vision of the human eye - we see anything happening at frame rate of 20 or more per second as continuous. If it were at a slower frequency of AC we would notice the changes in light intensity which occur at the different levels of voltage in the ac waveform.
Wiki User
∙ 11y ago
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If AC means alternating current used to light up a bulb and alternating current moves up and down then why doesnt the bulb alter?
The speed of the alterations at 120 per second (60 Hz) and 100 alterations per second (50 Hz) is too fast for the eye to see. The bulb looks like it is continuously on, with no perceivable alteration between on - off - on as the voltage goes through the cycle 60 times a second. It is this same eye slowness that allows us to see complete pictures on a TV screens.
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thanks for the important infos u put here. God bless you
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