Energy

Question 1

How often do we use energy?

Answer 1

Everyday

Question 2

What is respiration?

Answer 2

Releasing energy

Question 3

What is energy be measured in?

Answer 3

Joules (J)

Question 4

What is kinetic energy?

Answer 4

Energy when you are moving

Question 5

What is chemical energy?

Answer 5

Food, fuel and batteries contain chemical energy

Question 6

What is gravitational energy?

Answer 6

The higher something drops, the louder it is.

Question 7

What is elastic energy?

Answer 7

The more you stretch something, the more energy it uses.

Question 8

What is thermal energy?

Answer 8

The sun gives out its energy as heat (kettle, radiator)

Question 9

What is the law of conservation energy?

Answer 9

Energy cannot be created or destroyed only transferred from one form to another

Question 10

What is mass?

Answer 10

How much matter makes up the object

Question 11

What is weight?

Answer 11

Force acting down on mass

Question 12

How do you work out mass?

Answer 12

Kinetic energy
———————
1/2 x velocity(2)

Question 13

Speed equation

Answer 13

Kinetic energy
——————-
1/2 x mass

Question 14

What is velocity?

Answer 14

Speed with a direction

Question 15

What are the 4 different transfers?

Answer 15

Force, heating, waves, current

Question 16

Gravitational potential energy equation

Answer 16

GPE(J)= mass(kg)x gravity(n)xheight(m)

Question 17

What is elastic potential energy?

Answer 17

When materials are stretched or squashed, the work you do on them (energy) is stored as elastic potential energy

Question 18

Elastic potential energy equation

Answer 18

EPE(Ec)= 1/2 x spring constant x extension(2)x e(2)

Question 19

Equation for work done

Answer 19

Work done(J) = force applied(N) x distance moved along the line of action of the forces(metres)

Question 20

Efficiency formula

Answer 20

Useful power output
—————————
Total power input

Question 21

Dissipate

Answer 21

Energy that is spread and will not be used again

Question 22

Efficiency

Answer 22

A measure of how good a device is at changing energy from one form to another

Question 23

Energy transfer

Answer 23

The process of changing energy from one form into another

Question 24

Input energy

Answer 24

The energy going into a device

Question 25

Output energy

Answer 25

The forms of energy produced by a device

Question 26

Useful energy

Answer 26

Energy in a form that is wanted

Question 27

Wasted energy

Answer 27

Energy in a form that is not wanted or is not used

Question 28

Efficiency formula

Answer 28

Useful energy out
————————
Total energy in

Question 29

Total energy

Answer 29

Measured in joules (j)

Question 30

What is power?

Answer 30

The energy in joules transferred per second

Question 31

Power formula

Answer 31

Power (w)= energy(J)
————
Time (s)

Question 32

Electrical energy

Answer 32

Light energy + heat energy

Question 33

Power

Answer 33

Power= voltage x current

Question 34

Power supply formula

Answer 34

Power supplied= current x potential difference

Watts,W) (Amperes,A) (Volts, V