(physics) the difference of energy between the bottom of the conduction band and the top of the valence band of the electrons in a crystalline solid. For values below about 2eV the substance is considered to be a semiconductor whilst for higher values it is considered to be an insulator
noun 1. a measure of the efficiency of a heating or cooling system, as a heat pump or air conditioner, equal to the ratio of the output in B.T.U./hour to the input in watts: A high-efficiency home window air conditioner has an energy efficiency ratio of 7.5 or more. Abbreviation: EER.
noun 1. a comparative level of capacity for vigorous activity: The child has a high energy level. 2. Also called energy state. Physics. one of a quantized series of states in which matter may exist, each having constant energy and separated from others in the series by finite quantities of energy. noun (physics) 1. a […]
- Energy rating
noun a designation of the relative efficiency of an appliance, an estimate of the comparative annual energy consumption (kilowatt hours/year) of the appliance based on the tested energy consumption and information about the typical use of the appliance in the home
adjective 1. using electrical power in an efficient or economical way