Power efficiency refers to the ratio of useful power output to the total power input, expressed as a percentage. In wearable devices, achieving high power efficiency is crucial because it determines how long the device can operate on a given battery life, influencing user experience and functionality. Devices designed with power efficiency in mind ensure that they can perform tasks effectively without draining the battery quickly, leading to better usability and satisfaction for the wearer.
congrats on reading the definition of Power Efficiency. now let's actually learn it.