Energy -3rd Form Flashcards
1
Q
What is a system
A
An object or group of objects
2
Q
What are the energy transfers when an object is projected upwards?
A
Kinetic -> gravitational
3
Q
What are the types of energy stores?
A
- chemical potential
- thermal
- gravitational potential
- elastic potential
- kinetic energy
- nuclear energy
4
Q
What are the types of energy transfers?
A
- light
- sound
- electric current
5
Q
What is the specific heat capacity of a substance?
A
The amount of energy needed to raise the temperature of a 1kg substance by 1’c
6
Q
What is 1 Watt?
A
An energy transfer of 1 joule per second
7
Q
What are types of dissipation?
A
- radiation (light)
- thermal (convention and conduction)
- thermal (Friction)
- sound waves
8
Q
How can you stop dissipation?
A
- insulation to prevent thermal / sound energy escaping
- surround with something shiny to reflect light waves back in
- lubricate objects to reduce friction
- prevent objet from shaking , have silent parts
9
Q
What are the main energy sources available on earth?
A
- fossil fuels (coal, oil, gas)
- nuclear fuel
- bio-fuel
- hydro electricity
- geothermal
- tides
- the sun
- water waves
10
Q
What is the difference between a renewable and non renewable energy source?
A
A renewable energy source can be replaces as it is used however non renewable is a finite source
