Energy resources and energy transfers

Question 1

what are the eight types of energy stores?

Answer 1

1- kinetic
2- thermal
3- chemical
4- GPE
5- elastic potential
6- electrostatic
7- magnetic
8- nuclear

Question 2

what happens in kinetic?

Answer 2

anything moving has energy in its kinetic energy store

Question 3

what happens in thermal?

Answer 3

any object- the hotter the more energy it has in it’s store

Question 4

what happens in chemical?

Answer 4

anything that can release energy by a chemical reaction e.g food and fuels

Question 5

what happens in GPE?

Answer 5

anything that is in a gradational field (anything that can fall)

Question 6

what happens in elastic potential?

Answer 6

anything stitched like springs and rubber bands

Question 7

what happens in electrostatic?

Answer 7

two charges that attract or repel

Question 8

what happens in magnetic?

Answer 8

two magnets that attract or repel

Question 9

what happens in nuclear?

Answer 9

atomic nuclei releases energy from this store in nuclear reactions

Question 10

what are the four main ways that energy can be transferred between?

Answer 10

1- mechanically
2- electrically
3- by heating
4- by radiation

Question 11

what happens in mechanically?

Answer 11

an object moving due to a force acting on it e.g push or pull

Question 12

what happens in electrically?

Answer 12

a charge moving through a potential difference e.g charges moving through a circuit

Question 13

what happens in heating?

Answer 13

energy transferred from a hotter object to a cooler object

Question 14

what happens in radiation?

Answer 14

energy transferred by light/sound waves

Question 15

what is the principle of conservation of energy?

Answer 15

energy cannot be created or destroyed but it can be transferred from one store to another

Question 16

what is efficiency defined as?

Answer 16

efficiency= useful energy output/total energy input
x100

Question 17

what are the 3 ways energy can be transferred by heating?

Answer 17

radiation, conduction and convection

Question 18

what is thermal radiation?

Answer 18

the transfer of energy by heating by infrared electromagnetic waves

Question 19

what is conduction?

Answer 19

the main form of energy transfer by heating in solids

Question 20

what is convection?

Answer 20

the main form of energy transfer by heating in liquids and gases

Question 21

what does thermal radiation involve?

Answer 21

emission of electromagnetic waves

Question 22

what can thermal radiation also be called as?

Answer 22

infrared radiation, consists of electromagnetic waves of different frequencies .

Question 23

what do all objects continually do?

Answer 23

emit and absorb infrared radiation

Question 24

if an object is hotter than its surrounding what happens?

Answer 24

it emits more radiations that it abosrbs as it cools down

Question 25

if an object is cooler than its surrounding what happens?

Answer 25

it absorbs more radiation that it emits as it warms up

Question 26

is a solid is heated what happens?

Answer 26

the particles are held tightly together. when one particle vibrates, it collides with other particles nearby.

Question 27

definition of thermal conduction?

Answer 27

the process where vibrating particles transfer energy from their kinetic energy store to the kinetic energy stores of neighbouring particles.

Question 28

definition of convection?

Answer 28

convection occurs when the more energetic particles move from the hotter region to the cooler region and transfer energy only in liquids and gases.