Using Energy

Question 0

What are the three forms of stored energy

Answer 0

• chemical potential
• gravitational potential
• elastic potential

Question 1

Name the different forms of energy

Answer 1

• kinetic
• nuclear
• light
• sound
• electrical
• chemical potential
• elastic potential
• gravitational potential

Question 2

What sort of energy does a compressed spring have

Answer 2

Elastic potential

Question 3

What type of energy does every object that can rise off the ground have

Answer 3

Gravitational potential

Question 4

What are the energy transfers in a falling object

Answer 4

Gravitational potential; kinetic

Question 5

What is the conservation of energy

Answer 5

Energy cannot be created or destroyed

Question 6

What energy transfers take place when you turn on a torch

Answer 6

Chemical; electrical; light and heat

Question 7

What are the energy changes in an elastic band

Answer 7

Chemical energy; elastic potential energy

Question 8

What are the energy transformations in a solar cell

Answer 8

Light; electrical

Question 9

In terms of energy what happen when you burn fuel

Answer 9

Chemical energy in the fuel is transferred to the surroundings, which gets warmer

Question 10

What are the energy transfers in a swinging pendulum

Answer 10

Gravitational potential; kinetic; gravitational potential; kinetic…ECT

Question 11

What is a machine, in terms of energy

Answer 11

Something that transfers energy from one place to another or from one form to another

Question 12

What are the two kinds of energy do you get out of a machine

Answer 12

• useful

- waste

Question 13

What is useful energy

Answer 13

Energy that is transferred to the place we want or in the form we want

Question 14

What is waste energy

Answer 14

Energy that is not usefully transferred

Question 15

What happens to the wasted energy of an appliance

Answer 15

They are transferred to the surrounding which get warmer

Question 16

How is energy often wasted between the moving parts of a machine

Answer 16

Friction

Question 17

What are the effects in terms of energy of friction in a machine

Answer 17

It heats up the machine and the surroundings

Question 18

In which machines is friction useful

Answer 18

Car brakes and bike brakes

Question 19

Why Do we say energy is wasted not lost

Answer 19

Because the law of conservation states that energy cannot be created or destroyed

Question 20

What is the unit for energy

Answer 20

Joules

Question 21

What is the energy supplied to a machine often called

Answer 21

Input energy

Question 22

If 100 joules is input into a machine but 20 joules is wasted as sound energy, how much energy is useful

Answer 22

80 joules

Question 23

What makes a machine more efficient

Answer 23

If it wastes less energy

Question 24

Is there any machine that is 100% efficient

Answer 24

Yes an electric heater because it transfers all of its electrical heat to its surroundings

Question 25

When is electrical energy transferred

Answer 25

When an electric current flows

Question 26

Why do electrical appliances, such as TVs and computers have vents

Answer 26

So the wasted energy is transferred to the surroundings making them warmer, rather than the device itself .