Calculating the current of a household appliance

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electrophile

Joined Aug 30, 2013
126
I'm trying to build a ceiling fan regulator which incorporates a triac. I was trying to figure out the current rating for this and I was hoping someone would let me know if this is the right way to do it. Here goes:

The ceiling fan is rated for 75W. For 220VAC and a power factor of about 0.85 (from my research on the web but feel free to correct me) would the current be:

75/(220 x 0.85) = 0.4 A?

If this is correct, can I use a 1A (constant on-state) rated triac?
 

be80be

Joined Jul 5, 2008
2,049
I replace about 50 to 75 fans a year that people put on a dimmer they use capacitors to change speed and don't like dimmers at all
 

be80be

Joined Jul 5, 2008
2,049
That's cool but most new ones are lucky to make it a year before you can't stand to be in the room with them and forget to turn it up to full speed to start the fan and your just cooking the wires in it. I'm a electrician 35 years I've seen most anything that can go bad happen there are dimmable fans but most are not made to use dimmer
 
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