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# Conceptual Question No.12 – Equipments working in ac power

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• #693
Challarao

How can equipments work in ac current even it is oscillating from +ve to -ve and to zero?…
How can equipments work in ac current even it is oscillating from +ve to -ve and to zero?
Alternating current is alternation of positive and negative values.If we consider the sinusoidal case,the current value becomes zero,negative,positive in a cycle.In that case,how can electrical equipment can work without any interruption at zero value.For example,a tungsten bulb should blink continuously in every cycle of current.Please explain and correct if I am incorrect!

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• #2420
Hamid

The effects of ac current is related to amount of frequency strongly. If this amount be very low, the flicker of lamp illumination will be observable. The typical frequency range of observable flicker is from 0.5 to 30.0 Hz, with observable magnitudes starting at less than 1.0 percent. The human eye is more sensitive to luminance fluctuations in the 5- to 10-Hz range. As the frequency of flicker increases or decreases away from this range, the human eye generally becomes more tolerable of fluctuations. In discharge type lamp the traditional ballasts produce 100 pulses ( in 50 HZ) of current every second, and the phosphor

#2954
Krishna

what happen in the -ve half cycle i mean to say that, the bulb operates in the +ve half cycle, but does it work in the -ve half cycle to if yes, how and if not then what happens

#2955
Hamid

There aren’t any difference between negative and positive operation sycle in bulb.

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