Just sitting on the sofa at the weekend having my laptop on my lap. After quite a while, I felt uncomfortable because of the heat. The left side of the device contains the CPU. In my case, a Pentium M 1500 (ohoh, I must play the jingle now! But I can’t. Just do it inside your head. Otherwise, you are not allowed to read on.).
This Pentium M has the folloing technical data:
Die size: 0,82 cm2
Termal design power: 24,5 W

Let’s compare this to one my hot plates:
Size: 14cm -> area: 308 cm2
Power consumption: 1500W

The hot plate is ~375 times bigger than my cpu but it “only” ~61 times the energy. In other words:
If my CPU was a hot plate, it would only consume 4W.
If my hot plate was a CPU, it would consume ~9,200W!

If you would extrapolate the size of your CPU to the size of your hot plate, you should better cook your tea on the backside of your laptop!

I will consinder buying an asbestos-free heat shield for my legs to prevent burning them …