Check that the amperage is correct, and never use a penny under a burned fuse as a substitute. Watch for warmth. If outlets feel warm to the touch, have a qualified electrician check the wiring. The same thing goes for lamp fittings. Turn them off and unplug them.
Electric pads can cause serious burns, even at low settings.
And never tuck in electric blankets. The confined heat can start a fire. Never plug an electric heater into an extension cord. Instead, rely on better home wiring to handle the load by plugging home heaters directly into wall outlets. Avoid overloading outlets with multiple heaters.