A clear example of a potential ignition source is an overloaded power socket. This can generate heat and create sparks that may ignite nearby flammable materials, making it a direct ignition source. Other examples of potential ignition sources include electrical sparks, hot surfaces (such as stoves or electric heaters), mechanical sparks from friction, flames, and chemical reactions. Ignition sources generally involve any source that can provide enough energy—heat, sparks, or flame—to start a fire.