Efficiency

Real World Example

Imagine trying to fill a bucket with water using a leaky hose; no matter how much water you put in, some will always spill out before it reaches the bucket. This situation is similar to energy efficiency in machines, where some input energy is inevitably lost as heat or friction instead of being converted to useful work. Just as the effectiveness of filling the bucket depends on how much water actually makes it in despite the leaks, the efficiency of a machine is determined by the percentage of energy input that is successfully converted into work output, with the "leaks" being energy losses in the system.