Is there a problem if my copper coils for an electromagnet are heating up?
I have built a few little nail style electromagnets and they all heat up. If there is less power its slower but it still does. I have experimented by using this heat but on smaller coils it will start to smoke because it is to hot. This made me wonder if this is a short or actually an apply-able heat source. On a very large coil heat is generated but not enough to make smoke so is guess that it is actually losing power so it can't be a short.
SO CAN I USE THIS METHOD TO MAKE A MUG WARMER OR IS SHORTING OUT THE BATTERY