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Soldering
The tip of the iron is normally 700 °F, hot enough to melt metal. It is normal for
the handle of the soldering iron to heat up a bit. Hold it like a pencil and move
your hand further away from the tip if the heat is uncomfortable. The solder
smokes because the rosin inside the solder is burning off - it’s not harmful.
LEDs
Light-emitting diodes (LEDs) are like light bulbs, but much smaller and a lot
more efficient.
Photocell
A photocell changes resistance depending on the amount of light it is
exposed to. These little sensors make great ambient light triggers.
Learning More