4 Energy transfers

Question 1

What are examples of energy stores?

Answer 1

• Chemical
• Kinetic
• Gravitational
• Elastic
• Thermal
• Magnetic
• Electrostatic
• Nuclear

Question 2

What are some examples of chemical energy stores?

Answer 2

Food provides stored chemical energy that we can burn to transfer it to other types of energy.

Question 3

What are some examples of kinetic energy stores?

Answer 3

Our muscles transfer chemical energy to movement.

Question 4

What are some examples of gravitational energy stores?

Answer 4

When an object is raised up and held at height against the force of gravity, the energy is stored as gravitational potential energy. The greater the height, the more gravitational potential energy the object has.

Question 5

What are some examples of elastic energy stores?

Answer 5

Any object with a shape which can be changed and reformed has elastic potential energy. These objects can be stretched and squashed but this requires energy.

Question 6

What are some examples of thermal energy stores?

Answer 6

We use the energy that we gain from food to keep us warm (thermal energy).

Question 7

What are some examples of magnetic energy stores?

Answer 7

The energy stored when repelling poles have been pushed closer together or when attracting poles have been pulled further apart. This can be used in fridge magnets and compasses.

Question 8

What are some examples of electrostatic energy stores?

Answer 8

The energy stored when like charges are moved closer together or when unlike charges are pulled further apart.

Question 9

What are some examples of nuclear energy stores?

Answer 9

The energy associated with nuclear interactions. Nuclear fusion of hydrogen and helium in the Sun, Uranium-245 undergoing fission.

Question 10

How is wasted energy created?

Answer 10

When we transfer energy from one store into whichever store we require. Any time a force causes energy to go from one store into another

Question 11

What is a way to transfer energy mechanically?

Answer 11

By the action of a force.

Question 12

What is a way to transfer energy electrically?

Answer 12

By an electrical current.

Question 13

What is a way to transfer energy by heating?

Answer 13

By conduction, convection or radiation.

Question 14

What is a way to transfer energy by radiation?

Answer 14

By Light waves or Sound waves.

Question 15

What is the principle of the conservation of energy?

Answer 15

Energy is not created or destroyed in any process.

Question 16

How can we have an energy crisis then?

Answer 16

The energy which we use energy for necessary things in our day to day life - some energy will be used up and made into heat. This heat then escapes into our atmosphere and dissipates into the atmosphere. So the energy on earth is just becoming more spread out throughout our universe.

Question 17

What is the formula to find efficiency?

Answer 17

efficiency = useful energy output / x100
total energy output

Question 18

What do sankey diagrams show?

Answer 18

They are a simpler way of showing what happens to an energy input into a system

Question 19

What does the energy- in always equal to?

Answer 19

The energy out.