In my class we did an experiement where we measured the flicker frequency of an

Question

In my class we did an experiement where we measured the flicker frequency of an incandescent bulb and a CFL bulb (powered by a 60hz wall plug) using a photodiode and a osciloscope. We were then asked some questions about the sinusoidal curves that were produced.

1. The incandescent bulb probably has a large "DC offset". Why do you think this is? (im struggling with this question)

2. Is the flicker frequency for each of them the same as the 60hz wall plug frequency? why or why not?

From the experiement I found out that the frequencies were 120hz but I dont know why?

Please help

Explanation / Answer

1) LED/CFL dimmers also use forward phase control to dim LED and fluorescent bulbs

effectively and cheaply. Of the forward phase dimmers, LED/CFL dimmers are best

suited to work with LED bulbs. Like incandescent dimmers, they pass a DC offset

voltage and should not be used with a coil driver. The first LED/CFL dimmers were

offered by Lutron, and EnvironmentalLights was among the first to test and sell them.

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