A far better way is to use an opto isolated tria such as the MOC3020 to switch a mains triac.

Far safer as you are optically isolated from the mains.

Nick

Second, the way you encased the receptacle in cardboard is a fire hazard and against every relevant building code.

Third, saying “don’t use thin wire like on your headphones” is also creating a fire hazard. You have to know the amperage of the circuit (all wall circuits in the US are 120V with some special ones at 220v) and use the appropriate wire gauge. There’s a very good table for this at http://www.powerstream.com/Wire_Size.htm. Using too small a gauge can easily overheat the wire causing a breakdown in insulation and eventually a spark (see comment about using cardboard).

While I applaud your ingenuity in creating this control mechanism you must understand that your solution, as it stands, is highly unsafe.

I want to improve my SQL knowledge.
I red really many SQL books and want to
read more about SQL for my work as mysql database manager.

What would you recommend?

Thanks,
Werutz