(HT only) Explain how reducing unwanted energy transfers improves efficiency.

Reducing unwanted energy transfers is crucial for improving efficiency in any energy system. When energy is wasted, it is often dissipated into less useful forms, such as heat or sound, rather than being used for its intended purpose. By minimizing these losses—through methods like insulation, lubrication, or optimizing design—more of the input energy can be converted into useful work. This not only enhances the performance of devices but also leads to energy conservation, making systems more sustainable and cost-effective.