Voltage drop makes lights dim and motors run hot.

It reduces performance and can damage sensitive electronics over time.

Voltage drop happens because a long, thin extension cord adds resistance. By the time power reaches the end, some voltage has been lost. For incandescent lights, that means a noticeably dimmer bulb. For LEDs, it can cause flickering or failure to light up properly.

Motors and compressors (think: circular saws, refrigerators, space heaters) are worse affected. They draw more current to compensate for the lower voltage, which makes them run hotter. This shortens their life or can burn them out. That’s why a power tool feels sluggish on a long, skinny cord.

The fix is simple: use the shortest extension cord that reaches, and pick the thickest wire gauge you can carry. For long runs, go up a gauge (lower number). Don’t plug a high-draw appliance into a 100-foot 16-gauge cord and expect it to work like it’s wired into the wall.

Buy the shortest, thickest cord you can get away with. Your tools will thank you.