Final answer:
Choosing the correct size of conductors in an extension cord is important to avoid significant voltage drop, which can reduce the effectiveness of the appliance being powered. A higher resistance or the drawing of large currents increases the voltage drop, impacting the appliance performance.
Step-by-step explanation:
When using an extension cord for portable power tools, it is crucial to ensure that the size of the conductors is appropriate to minimize voltage drop. A voltage drop occurs due to the resistance of the extension cord's conductors, leading to less voltage being available for the appliance at the end of the cord.
For example, a cord with a resistance of 0.0600 ohms with 5.00 A current flowing through it would have a voltage drop calculated using Ohm's law (V = IR). So if a larger current is drawn or if the resistance is higher, as in a cord with thin wire or one that is very long, the resulting voltage drop could be significant. This voltage drop could lead to reduced power output for the appliance, affecting its performance and causing it to work improperly.
It's also important to understand that, especially when working with high-power electric circuits, various safety precautions, including working 'one-handed' or 'keeping one hand in your pocket,' are advised to minimize the risk of electric shock.