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Using a #10 wire extension cord is the best solution for maintaining power when a circular saw is located 69 m (200 ft) away from the power source. Extension cords have specific wire gauges that determine their current-carrying capacity, and using a thicker wire gauge, such as #10, minimizes voltage drop over long distances.

Voltage drop occurs when electrical energy dissipates as it travels through a conductor, affecting the performance of electrical tools. A larger gauge wire can carry more current without significant loss of voltage, ensuring that the circular saw receives adequate power for optimal performance. This is especially important with power tools that require consistent voltage to operate effectively.

In contrast, using a #14 wire extension cord would not provide sufficient current handling for a tool like a circular saw located at that distance, potentially leading to performance issues. Simply replacing the circular saw with one that has lower amperage would not resolve the underlying issue of voltage drop, as the power supply and distance would still be problematic. Moving the power source closer is a viable option but may not be practical or possible in all work scenarios and does not address the need for immediate power at a distance.