P1 Flashcards
Different types of energy
8
- Gravitational potential energy
- Thermal energy
- Kinetic energy
- Elastic potential energy
- Chemical energy
- Magnetic energy
- Electrostatic energy
- Nuclear energy
The law of conservation of energy
Energy cannot be created or destroyed, only transformed into another type of energy
Kinetic energy equation
EK = 1/2 x m x v ²
Elastic potential energy equation
Given in the exam
Ee = 1/2 x k x e ²
Gravitational potential energy Equation
Ep = m x g x h
Change in thermal energy equation( given in the exam)
^E = m x c x ^•
Energy can be_____
Wasted
Give an example of where energy can be wasted
In a lightbulb
Electrical energy goes in and is transferred to light(useful)
It’s also transferred to heat and sound energy(wasted)
What happens to wasted energy
Wasted energy dissipates into the surroundings
How can heat be detected
Use a infrared camera
What’s the way that infrared cameras can be used to see
How well the house is insulated
The roof and the windows tend to be blue to show good installation
What do you infrared camera colours show
Blue shows not much heat escaping
Read shows heat escaping
Energy efficiency in houses
- Cavity wall insulation
- Double glaze windows
- Carpets
- Curtains
- Jacket around hot water tank
Efficiency equations
- energy
- power
Efficiency = useful energy out/total energy in
Efficiency = useful power out/Total power in
What are renewables
Give examples and advantages and disadvantages
Renewable resources won’t run out, you can get more.
Examples include sun, Wind, HEP and geothermal
Advantages- don’t release CO2, never going to run out
Disadvantages- Unreliable, expensive
