Energy

Question 1

what is a system?

Answer 1

A system is an object or group of objects.
There are changes in the way energy is stored when a system changes.

Question 2

What is kinetic energy?

Answer 2

The kinetic energy of a moving object can be calculated using the equation:
kinetic energy = 0.5 × mass × s peed 2

Question 3

What is power?

Answer 3

Power is defined as the rate at which energy is transferred or the rate at which work is done.

Question 4

How does heat change conductivity?

Answer 4

The higher the thermal conductivity of a material the higher the rate
of energy transfer by conduction across the material.

Question 5

What are the main energy resources for use on Earth?

Answer 5

The main energy resources available for use on Earth include: fossil fuels (coal, oil and gas), nuclear fuel, bio-fuel, wind, hydroelectricity, geothermal, the tides, the Sun and water waves.

Question 6

What is a renewable resource?

Answer 6

A renewable energy resource is one that is being (or can be) replenished as it is used.

Question 7

What are uses for energy?

Answer 7

The uses of energy resources include: transport, electricity generation and heating