Final answer:
Carla had her body fat measured using Bioelectric Impedance Analysis (BIA), which sends a small electrical current through the body to assess body composition based on how fat impedes electrical conductivity.
Step-by-step explanation:
The method used to measure Carla's body fat by sending a low level of electrical current through her body is known as Bioelectric Impedance Analysis (BIA). This technique is based on the principle that the presence of fat in the body slows down the passage of electricity. A small, safe amount of electricity is passed through the body, and the rate at which it travels is used to determine the body's composition. This can be directly translated into an assessment of body fat percentage, as body fat has different electrical conductivity than other tissues such as muscle or bone.
BIA devices can be found as home-use body composition scales. They provide a convenient and quick way for individuals to monitor their body fat levels as part of a health and fitness regimen. It's important to note that the accuracy of BIA can be affected by factors such as hydration level and is best used under consistent conditions for comparative purposes.