[SML] Dimming a 24vac load

[Jerry Durand]

At least some lamps last longer on AC than DC due to ion migration.

On 07/03/2015 04:51 AM, Dan Sheehan via Stagecraft wrote:
> At the same nominal voltage, an incandescent lamp will run
> equally bright on AC as on DC.
>
> The AC nominal voltage is the root mean square of the waveform;
> the square root of the mean of the squares 
> of many infinitesimally small samples over a complete line cycle.
>
> squaring and then taking the square root makes it all positive,
> "mean" is like an average over the time of one complete cycle...
> which makes 120 VAC produce the same heating power in a resistor as
> 120 VDC.
>
> HTH
>
>

-- 
Jerry Durand, Durand Interstellar, Inc.  www.interstellar.com
tel: +1 408 356-3886, USA toll free: 1 866 356-3886
Skype:  jerrydurand 

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