/diy/ - Do It Yourself

>>1630193
Firstly. this was a thorough, exhaustive, base-level explanation in lamen's terms that I did not expect to get. Whether it's instant paste from some digital text is irelevant, you have my thanks.

Secondly, I don't think the copper is coated at all. Sure, I won't plug it into a wall socket and close the terminals with my tongue, I just want to connect it to a couple batteries; but what about other things that touch it and might be moist - curtains, bedsheets, animal fur? If they conducted the current from the (possibly) exposed wires, would that be enough to start a fire or otherwise be dangerous?

Are simple batteries DC?

There's some component in the battery box between the switch and the wires (pic related) - what could it be, and is it needed? (I assumed it's a resistor)

Despite the recent /pol/ invastion, /diy/ is still the best board by far.