Cheatography
https://cheatography.com
1. Temperature Changes
2. Transferring Energy
3. Electricity
4. Efficiency in Percentage
5. Controlling Energy Transfer
6. Paying for Energy
Energy (Temperature Changes)
Internal (Thermal) Energy -> Energy stored in the movement of particles |
Amount of internal energy depends on temperature, materials, mass |
Temperature -> How hot or cold something is |
|
Efficiency Formula (Energy)
Formula: Efficient Powers / Total Amount of Electricity Produced x 100% = Percentage |
4/40 x 100% = 100 |
Energy Formula
Formula: Q = mcAT |
Q -> Amount of heat transfered |
Energy Formula
Formula: Q = mcAT |
Q -> Amount of heat transfered |
M = Mass |
C = Specific Heat Capacity |
A = The changes in temperature |
T = Temperature |
In a refrigerator, 2kg of water cools from 30 °C to 0 °C and then freezes to form ice at 0 °C. The specific heat capacity of water is 4200 J kg °C, and the specific latent heat of fusion of ice is 336000 J kg °C. What is the heat washed in this process?
Q1 = mcAT = 2 x 4 x 200 x -30
Q2 = mAHf = 2 x -336000
Q1 + Q2 = -924000
|
|
Listric Energy
Appliances -> Machines |
Power -> Different appliance transfer different amount per second |
Wratts -> Method measurement of the rate of electricity |
Power rattings -> Max amount of power a device produce under normal circumtances |
Efficiency -> Ratio of useful energy from total energy |
Sankey Diagram -> Diagram that shows efficiency |
|
|
Transfering Energy
Evaporation |
Conduction -> Passing vibrations (heat) |
Radiation -> All objects emit infrared radiation (hotter, emit more, no need medium, thermal imagers) |
Convection -> Cooler fluid sink, hotter fluids rise |
Paying for Energy
Unit (Times, Energy, Power wrattings) |
Electricity and gas are paid base on usage and measure in KwH |
Formula -> KW x H x KwH (Hour) |
Controlling Energy Transfer
Insulation -> Retain warmth inside the house and reduces fuel costs. |
Air is only good conductor if it is trapped |
To test insulation effectiveness, use containers with different insulating materials and measure temperature changes over time. |
Light color -> Reflect energy, while Dark color -> Emit radiation |
|
Created By
Metadata
Comments
No comments yet. Add yours below!
Add a Comment
Related Cheat Sheets