![]() This would break the law of conservation of energy. This would mean that more energy is being transferred than is being supplied, which would mean that energy is being created. It is not possible to have an efficiency of greater than 1 or efficiency percentage of 100%. ![]() This means that the transformer only wastes 5% of the energy supplied to it. The transformer is very efficient, since 95% of the energy supplied to it is usefully transferred. The efficiency can be calculated as a decimal or a percentage, using the equations: The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways. Ī very efficient device will waste very little of its input energy.Ī very inefficient device will waste most of its input energy. How good a device is at transferring energy input to useful energy output is called efficiency. This means that as much of the input energy as possible should be transferred into useful energy stores. This way, you’ll gradually work through the areas that you’re weak in.Devices are designed to waste as little energy as possible. Understand why you’re getting them wrong, and how to find the right answer. Go back and review the concepts behind those problems. This indicates that you’re weak in this particular area. While doing practice problems, you’ll probably encounter some that are difficult for you. Review problems that you had trouble with. Finally, enjoy using the native mobile app, and before you know it, you'd have answered hundreds of questions, drilling the content into your memory. Go through our questions of the day at any time to get started with your exam preparation, browse our collection of articles to find methods, tools, best practices, and examples to maximise your learning. RevisePal offers all the tools you need to be successful in passing your upcoming GCSE exams. ![]() Use the RevisePal mobile app to practice your way to success. If you have a physics test coming up, however, you can do well with good study strategies. Physics is a difficult subject, and many students have trouble with it. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in these and other academic disciplines such as mathematics and philosophy. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. Over much of the past two millennia, physics, chemistry, biology, and certain branches of mathematics were a part of natural philosophy, but during the Scientific Revolution in the 17th century these natural sciences emerged as unique research endeavours in their own right. Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps the oldest. A scientist who specialises in the field of physics is called a physicist. Physics is one of the most fundamental scientific disciplines, with its main goal being to understand how the universe behaves. Physics is the natural science that studies matter, its fundamental constituents, its motion and behaviour through space and time, and the related entities of energy and force.
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