1.7 Energy, Work & Power Flashcards
1
Q
What are the four energy transfer pathways?
A
- Mechanical working (pulling/pushing, stretching/squashing)
- Electrical working
- Heating by particles (conduction)
- Heating by radiation
2
Q
Formula to find kinetic energy
A
EK = Kinetic energy
m = mass
v = speed
3
Q
Formula to find gravitational potential energy
A
ΔEp = Change in gravitational potential energy
m = mass
g = gravitational field strength
Δh = change in height
4
Q
Formula for work done
A
Work done = force x distance = change in energy
5
Q
Formula for power
A
Power = work done over time (OR energy over time)
6
Q
What is efficiency?
A
A measure of the amount of wasted energy in an energy transfer
7
Q
Formula for efficiency
A
(Can also be written in terms of power instead of energy)
8
Q
List renewable sources of energy
A
Solar, hydropower, tidal, wind, geothermal, wave, biomass
9
Q
List non-renewable sources of energy
A
Nuclear, fossil fuels (coal, oil, gas, etc)
