Energy, work and power Flashcards
What is energy
The ability to do work
State the types of energy
Write in the book
mSI unit for stored energy
Joules
Equation for:
Kinetic energy
K.E = 1/2 * mass * velocity^2
K.E = 1/2 mv^2
Equation for:
Gravitational potential energy
G.P.E = mgΔh
G.P.E = mass * acceleration of gravity * change in height
What is:
Work
W = ΔE
شغل
another equation for:
Work
apart from change in energy
W = Fd
3 methods of:
Producing electricity from water
- Hydroelectric
- Tidal
- Wave
Solar power comes in two forms
State them
Solar panels and solar cells
Name all that you can recall
Renewable energy resources
- Hydroelectric
- Tidal
- Wave
- Solar
- Wind
State:
Energy sources thath are enviromentally friendly
No greenhouse gases
- Nuclear
- Hydroelectric
- Tidal
- Wave
- Solar
- Wind
- Geothermal
State:
all the energy resources that you can think of
- Nuclear
- Hydroelectric
- Tidal
- Wave
- Solar
- Wind
- Geothermal
- Fossil fuels
Advantages and disadvantages of:
Fossil fuels
- high power output
24 hours a day output
cheap to build - non-renewable
produces greenhouse gases
Advantages and disadvantages of:
Nuclear
+ High power output
24 hours a day output
no greenhouse gases
- Non-renewable
Radioactivity risks
Very expensive to build
Advantages and disadvantages of:
Hydroelectric
+ renewable resource
no greenhouse gases
high power output
- disrupts animal habitats and displaces people
needs a big river
expensive to build
Advantages and disadvantages of:
Tidal
+ renewable resource
no greenhouse gases
high power output
- needs high tides, not common
blocks large area of sea
expensive to build
Advantages and disadvantages of:
Wave
+ renewable resource
no greenhouse gases
- New technology, not reliable
Low power output
Advantages and disaadvantages of:
Solar
+ renewable resource
no greenhouse gases
- unreliable, needs sunshine
low power output
expensive to build
Advantages and disadvantages of:
Wind
+ renewable resource
no greenhouse gases
cheap to operate
- unreliable, needs wind
low power output per turbine
expensive to build
Advantages and disadvantages of:
Geothermal
+ renewable resource
no greenhouse gases
reliable output
- only a few volcanic countries
relatively low power output
Equation of:
Effeciency
for energy and power input/output
Useful energy output / energy input * 100
Useful power output / power input * 100
Define:
Power
Rate at which energy is transfered
Equation of:
Power
Energy transsfered / time
or
Work done/time
