Energy and Efficiency Flashcards
(6 cards)
Most Kids Hate Learning GCSE Energy Names
Most Kids Hate Learning GCSE Energy Names. Each capital letter is the first letter in the name of a type of energy: Magnetic - Energy in magnets and electromagnets. Kinetic (movement energy) - Energy in moving objects. Heat (Thermal Energy) - Energy in hot objects. Light - Also called Radiant Energy. Gravitational potential - Stored energy in raised objects. Chemical - Stored energy in fuels, food and batteries. Sound - Energy released in vibrating objects. Electrical - Energy in moving charges or static electric charges. Elastic potential - Stored energy in stretched or squashed objects. Nuclear - Stored in the nuclei of atoms.
What is the difference between a Sankey diagram and an Energy Transfer diagram?
Energy transfer diagrams only show the useful energy transfers. A Sankey diagram shows the total energy input, the useful energy and wasted energy.
State 2 facts about energy.
Energy can be transferred usefully, stored or dissipated. It cannot be created or destroyed.
What is the efficiency of a device?
The efficiency of a device is the proportion of the energy supplied that is transferred in useful ways.
How do you calculate efficiency?
efficiency = useful energy out ÷ total energy in (for a decimal efficiency) Note that the efficiency of a device will always be less than 100 percent.
How do you calculate the amount of electrical energy transferred to an appliance?
E = P × t E is the energy transferred in kilowatt-hours, kWh P is the power in kilowatts, kW T is the time in hours, h.
