I'm right in thinking a coil of wire that takes an electricity current produces both an electromagnetic field and heat, yes?

I'm specifically curious about the heat side of things. My 20m extension lead is only wound out to about 5m. I use it to get from the plug socket in my bedroom to the bedside chest of drawers.

Noramlly I use this 4-way to power a phone charger and a desk side lamp with a 30 watt blub in. But this evening I've had one of those electric heaters on. It's been on about 2 hours now.

I just went to move the power adapter so that the heater was nearer my computer desk and it's very warm to the touch. And by very warm I mean hot. I can't even touch the wire that was at the center of the coil. It's the kind of heat that makes you say out loud naughty words like "Fuck" and immediately drop the thing your holding.

I feel burnt. :/

And if I don't post again for a few days you know that uncoiled the heat still built up, my flat set on fire, I burnt in the process and my family and friends are currently greiving.

Rather than ending pesimistcally, I'll leave you with the good news that I've bought a brand new, chome coloured, nine hundred watt, combined grill and microwave! Splendid!

[Edit: I've just spied a phrase on the adapter... "warning, unwind fully before use!"]