Common household fire extinguishers are only intended to snuff out small fires before they become serious. Keep as many as necessary to grab quickly before a fire gets out of control. For starters, you should probably have one in the kitchen, at least one on each floor, one in the garage, and one near valuable electronic equipment.
The kind of fire extinguisher you should use depends on what’s burning. Different types of extinguishers are available for different types of fires, and each is prominently labeled with an alpha designation:
• Class C fires: electrical equipment.