Topic-10 Energy Flashcards Preview

Science Year 8 > Topic-10 Energy > Flashcards

Flashcards in Topic-10 Energy Deck (37):
1

Energy

Describes anything "that can do work"

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Law of conservation of energy

Energy cannot be created or destroyed. Only transferred

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Gravitational

Potential energy of an object elevated above the ground

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Elastic

Energy stored by an elastic object that is stretched, such as a spring or rubber band

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Chemical

Energy stored in chemicals that, when reacted together such as in burning reactions, release heat, sound or light.

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Nuclear

Energy stored in the nucleus of atoms that can release energy slowly, such as In a nuclear reactor, or quickly, such as in a nuclear explosion.

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Electrical

Energy supplied to homes by powerlines and available to your appliances via power outlets in the home.

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Kinetic

Energy possessed by objects that are moving

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Heat

Energy that causes objects to gain temperature

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Light

Energy that may be released, for example, when an object is hot or by a nuclear reaction in a star.

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Sound

Energy carried by the air in a room and detected by the ear.

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Efficiency

The fraction of energy supplied to a device as useful energy it is usually expressed as a percentage.

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Conduction

Transfer of heat through collision between particals

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Insulator

A material that is a poor conductor heat

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Convection

Transfer of heat through the flow of particles

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Radiation

A method of heat transfer that does not require particles to transfer heat from one to another

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Radiant heat

Heat transferred br radiation, as from the sun to the earth

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Reflected

Bounced off

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Transmitted

Passed through something, such as light or sound passing through air

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Deciduous

Describes plants that lose their leaves during autumn and winter

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Luminous

Releasing its own light

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Incandescent

Describes objects that emit light when they are hot

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Bioluminescent

Describes living things that release light energy

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Non-luminous

Describes objects that do not emit their own light, but can be seen by reflected light

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Scattered

Describes light sent in many directions by small particles within a substance

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Visible spectrum

Different colours that combine to make up white light; they are separated in rainbows

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Dispersion

Separation of the colours that make up white light. Each colour is bent differently when it enters or leaves a glass prism.

28

Electromagnetic radiation

The radiant energy such as radio waves, infrared, visible light, x-rays and gamma rays released by magnetic or electric fields

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Electromagnetic spectrum

Complete range of wavelengths radiated as electric and magnetic fields

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Radio waves

Low energy electromagnetic waves with a much lower frequency and longer wavelength than visible light

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Infra-red radiation

Invisible radiation emitted by all warm objects. You feel infra-red radiation as heat

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Ultraviolet radiation

Invisible radiation similar to light but with a slightly higher frequency and more energy

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X-ray

an electromagnetic wave of high energy and very short wavelength, which is able to pass through many materials non transparent to light

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Gamma rays

High energy electromagnetic radiation produced during nuclear reactions

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Rays

Narrow beams of light

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Convex

Refers to a lens that is curved outwards

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Focal point

The point where light rays 'close in' (converge towards a point