Final answer:
Bioelectrical Impedance Analysis (BIA) is the technique that estimates body fat percentage by measuring electrical current resistance in the body, indicating that fat slows the electrical flow.
Step-by-step explanation:
The body composition assessment technique that estimates body fat percentage by measuring the resistance to the flow of electrical currents introduced into the body is Bioelectrical Impedance Analysis (BIA). This method is based on the principle that fat tissue slows down the passage of electricity more than lean tissue. By passing a small electrical current through the body and measuring how quickly it travels, BIA devices can determine body composition. These devices, which can be sold for home use, are sometimes referred to as body composition scales. BIA is considered a convenient and non-invasive way to estimate body fat percentage.