The unavailable energy typically transforms into a form that cannot be readily harnessed to perform useful work. This is known as dissipated or wasted energy. It may manifest as heat loss, sound, friction, or other forms of energy loss that are not useful for performing work. For example, when electricity is transmitted through power lines, a portion of it is dissipated as heat due to resistive losses. Similarly, in most energy conversion processes, there is always some energy that is lost and ultimately becomes unavailable for useful work.
