Buying a fire extinguisher for your home is a good idea, but you've got to know what type to buy.
Fire extinguishers are marked A B C or D based on the type of fire they can put out. "A" - is ordinary fuels like wood, plastics, or cloth. "B" is for flammable liquids and "C" is electrical fires. For the best protection, purchase a multi-purpose extinguisher with a "BC" or "ABC" rating for typical home use, and check its pressure regularly.