Uncoil extension cords under heavy load.

Yes, coiling can cause overheating — but only under the right (or wrong) conditions. If you’re running a space heater, table saw, or anything that draws near the cord’s rated amperage, a tightly coiled cord acts like an inductor. That creates heat, and heat melts insulation, which starts fires.

For low-draw stuff like a phone charger or a lamp? Coil away. No problem. The risk is real when you pull serious current through a coil. So if you’re not sure, uncoil the whole thing. It takes five seconds and costs nothing.

Future you wants the cord to stay intact.