Don't overload sockets - one plug per socket is the rule, especially if the appliance takes a lot of power (like a kettle).
Don't run extension cables across the floor as they can become worn.
Is the electric kettle leaking? This can be dangerous.
If you're called away from the cooker - by the phone, say, or by someone at the door - take pans off the heat. It's the easiest thing in the world to forget about them.