What should you check before using a power tool?

Before using a power tool, it is essential to ensure that it is in good working condition and to check the power source. This step is crucial for safety and operational efficiency. Ensuring that the tool is in good working condition involves visually inspecting it for any signs of damage, wear, or malfunction, which could lead to accidents or ineffective work. Additionally, checking the power source—whether it's a battery, plug, or air supply—helps ensure that the tool will operate correctly and prevents any electrical hazards or interruptions during use.

The other options do not contribute to the fundamental safety and effectiveness of the tool. The color of the tool does not impact its operation or safety. Knowledge of whether the tool has been used recently isn't a direct indicator of its condition; it could have been misused or inadequately maintained regardless of recent usage. Lastly, using the latest model may seem advantageous, but if that model is not functioning properly or suited for the task at hand, it does not ensure safe or efficient performance. Therefore, the emphasis on checking the tool’s condition and power source is pivotal for both safety and performance in power tool usage.