P4: Energy Types and Transformation

Question 1

What form of energy does a stretched spring have?

Answer 1

Elastic potential energy

Question 2

What are the useful energy transfers that take place in a hairdryer?

Answer 2

Electrical energy to kinetic energy and energy transferred by heating

Question 3

What are the useful energy transfers that take place in a TV?

Answer 3

Electrical energy to light and sound

Question 4

What energy transfers take place when you lift a ball into the air and then drop it so it falls to the ground?

Answer 4

Kinetic energy to gravitational potential energy to kinetic energy

Question 5

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

Answer 5

So that wasted energy can be transferred easily to the surroundings making them warmer, rather than the TV or the computer

Question 6

60J of energy are supplied each second to a light bulb, the bulb transfers 18J of energy to light each second. How much energy does the bulb waste each second?

Answer 6

42 Joules

Question 7

What form of energy does a moving car have?

Answer 7

Kinetic energy

Question 8

What is energy?

Answer 8

The ability for something to do work.

Question 9

What is energy transformation?

Answer 9

One type of energy changing into another

Question 10

Name the 9 types of energy

Answer 10

•kinetic •heat/thermal •light •gravitational potential •chemical •sound•elastic potential •electrical •nuclear

Question 11

What type of energy does any object above the ground have?

Answer 11

Gravitational potential

Question 12

Name the energy transfer that happens when an object falls

Answer 12

Gravitational potential –> kinetic

Question 13

Name three forms of stored energy

Answer 13

•gravitational potential •elastic potential •chemical

Question 14

What form of energy does a compressed spring have?

Answer 14

Elastic potential energy

Question 15

Where does the energy stored in your muscles come from?

Answer 15

From the food (chemical) that you eat

Question 16

Name the main energy transfer and waste energy of a torch

Answer 16

Main energy transfer:

Chemical –> light

Waste: Heat

Question 17

Name the main energy transfer and waste energy of a car

Answer 17

Main energy transfer:

Chemical –> kinetic

Waste: Heat & Sound

Question 18

What energy transfer does stretching an elastic band cause to happen?

Answer 18

Kinetic –> Elastic Potential

Question 19

What is the ‘law of conservation of energy’?

Answer 19

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

Question 20

For each step of electricity generation in a coal fired power station, state the energy type.

coal –> burning coal–> hot water–> steam–> turning turbine –>generating electricity

Answer 20

• coal (chemical)
• –> burning coal (heat)
• –> hot water (heat)
• –> steam (kinetic)
• –> turning turbine (kinetic)
• –>generating electricity (electrical)