Which of the following is a good technique when using a fire extinguisher?

The correct approach when using a fire extinguisher is to direct it at the base of the flames using a sweeping motion. This method is effective because fires burn from the bottom up, and targeting the base helps to smother the flames at their source. By using a sweeping motion, you cover a wider area and ensure that the extinguishing agent is evenly applied, maximizing its effectiveness in putting out the fire.

In contrast to this valid technique, aiming at the top of the flames is not effective because it does not address the source of the fire. Shaking the extinguisher is unnecessary and may not enhance its performance, while holding the extinguisher upside down would prevent proper use and could lead to ineffective discharge of the extinguishing agent. Understanding the correct use of a fire extinguisher is crucial for safely and effectively managing small fires.