Microwave Sparking or Arcing: Stop Using It

Unplug it first, then work out which of four causes it was. Two are your fault and fixable, two are the appliance. And never, under any circumstances, open the cabinet.
Electric Burner Not Heating: What’s Replaceable and What Isn’t

Three cooktop types, three different answers. On one of them the element is a plug-in part; on the other two the repair is behind the glass and it is not yours.
If You Smell Gas at the Stove: Stop and Do This

Leave the building. Do not touch a switch, a light or a phone on the way out. Call from outside. There is no repair on this page and there should not be one.