This introduction covers The Leaky Bucket Problem within Efficiency for GCSE Physics. Revise Efficiency in Energy for GCSE Physics with 19 exam-style questions and 4 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 1 of 13 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 1 of 13
Practice
19 questions
Recall
4 flashcards
♻️ The Leaky Bucket Problem
Here is a humbling truth: every machine ever built wastes energy. Every single one. An old incandescent light bulb converts only about 5% of electrical energy into useful light — the other 95% becomes heat, which is why they burn your fingers. Modern LED bulbs reach around 40–50% efficiency. Even the human body is only about 25% efficient at converting food energy into movement. Engineers have spent centuries trying to reduce waste and get closer to 100% efficiency — but it remains physically impossible. The second law of thermodynamics guarantees that some energy will always be "wasted" as heat. Your job in physics is to calculate how much useful energy actually makes it through.