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Science - energy

Science test revision on energy

What is the law of conservation? Energy cannot be created or destroyed, it can only be transformed, transferred, or stored.
What is potential energy? Stored in objects, to be transformed to other types of energies.
What are the three types of potential energy? Gravitational energy, Elastic potential energy, and Chemical potential energy.
What is an example of potential energy? The energy stored in fireworks is not apparent till it explodes - potential
What is kinetic energy? The energy of motion, this means that any moving objects has kinetic energy.
What is useful energy? The intended product of an energy transformation - the heat and air of a hairdryer.
What is wasted energy? Any unwanted energy forms that are produced in an energy transformation, and doesn't matter - the sound from a hairdryer.
What is heat energy transfer? Heat is energy in transit from an object or substance to another with a lower temperature.
What three different ways can heat move from substances? Conduction, Convention, and radiation.
What is radiation? The transfer of heat from electromagnetic waves, aka transferred via radiant heat - warmth from the sun, sitting by a fire.
What is conduction? When heat is transferred by a substance flowing from a warmer area to a cooler area through direct contact between SOLID OBJECTS
What is convection? When heat is transferred by a substance flowing from a warmer area to a cooler area in LIQUIDS OR GASES
What is the purpose of a Sankey diagram? Shows us the amount of useful vs non useful energy produced in energy transformation
What does efficiency means when applying to energy transformations. means the amount of useful energy produced, to be efficient than most of the energy should be useful
Electricity The flow of electrons through wires that provide energy to components attached to an electrical circuit.
Electronic devices transform electrical energy into other types of energy. - is this true or false yes
What are 2 everyday examples where energy is being used. Solar panels, and a fridge.
Define Gravitational potential energy The energy stored in an object due to its position within a gravitational field. - eg, a roller coaster at the top of a big drop.
Define Elastic potential energy Elastic potential energy is the energy stored in an elastic material or spring when compressed or extended. - eg, a trampoline when you land, this potential energy converts into kinetic which propels you into the air.
Define Chemical potential energy Chemical potential energy is the energy stored within objects, created when atoms and molecules bond. - eg, batteries
Created by: 537370
 

 



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