Works

Question 1

Electrical energy

Answer 1

Electrical energy: the energy made available by the flow of electric charge through a conductor

Question 2

Gravitational potential energy

Answer 2

Gravitational potential energy: energy stored due to the height of an object above a base level

Question 3

Elastic potential energy

Answer 3

Elastic potential energy: describes a material that is able to return to its original size after being stretched

Question 4

Nuclear energy

Answer 4

Nuclear energy: the energy stored at the centre of atoms, the tiny particles that make up all substances. Nuclear energy can be released from the radioactive metals uranium or plutonium, and transformed into electrical energy in a nuclear power station.

Question 5

Efficiency

Answer 5

Efficiency: the fraction of energy supplied to a device as useful energy. It is usually expressed as a percentage.

Question 6

Chemical energy

Answer 6

Chemical energy: potential energy derived from chemical reactions

Question 7

Conduction

Answer 7

Conduction: transfer of heat through collisions between particles

Question 8

Insulator

Answer 8

Insulator: a material that is a poor conductor of heat

Question 9

Convection

Answer 9

Convection: transfer of heat through the flow of particles

Question 10

Radiation

Answer 10

Radiation: a method of heat transfer that does not require particles to transfer heat from one place to another

Question 11

Radiant heat

Answer 11

Radiant heat: heat transferred by radiation, as from the sun to the Earth

Question 12

Reflected

Answer 12

Reflected: bounced off

Question 13

Transmitted

Answer 13

Transmitted: passed through something, such as light or sound passing through air

Question 14

Absorbed

Answer 14

Absorbed: taken in

Question 15

Luminous

Answer 15

Luminous: releasing its own light

Question 16

Incandescent

Answer 16

Incandescent: describes objects that emit light when they are hot

Question 17

Bioluminescent

Answer 17

Bioluminescent: describes living things that release light energy

Question 18

Scattered

Answer 18

Scattered: describes light sent in many directions by small particles within a substance

Question 19

Vibrations

Answer 19

Vibrations: repeated fast, back-and-forth movements

Question 20

Compression

Answer 20

Compression: the process of pushing a material into itself

Question 21

Rarefactions

Answer 21

Rarefactions: in sound waves, the layers of air particles that are spread apart (between compressions)

Question 22

Sound waves

Answer 22

Sound waves: vibrations of particles in the air

Question 23

Reverberations

Answer 23

Reverberation: longer-lasting sound caused by repeated reflection from hard surfaces

Question 24

Law of conservation of energy

Answer 24

Law of Conservation of Energy: a law that states that energy cannot be made or lost. However, energy can be transformed from one type to another or transferred from one object to another.