Energy, work and power Flashcards
(23 cards)
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
