A very inefficient device will waste most of its input energy. The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways. The efficiency can be calculated ...

The questions in this quiz are suitable for GCSE physics students studying work, power and efficiency, energy and power, efficiency and electrical appliances. If you struggled with the quiz, don't ...

Physics training taught Brian Gerke how to figure out anything; now he’s applying his skills to energy-efficiency research, helping to set national standards. Brian Gerke follows the second law of ...