Energy Flashcards
Define Specific Latent Heat of Vaporisation.
The energy required to change 1kg of a substance from a liquid to a VAPOUR with no temperature change
Define Specific Latent Heat of Fusion.
The energy required to change 1kg of a substance from a solid to a liquid with no temperature change
Name the 4 most common types of energy store included in an exam question.
Kinetic, Gravitational, Elastic and Thermal
Give the four energy pathways.
Mechanical
Light
Electrical
Heating
Give a short description of the mechanical energy pathway.
Mechanical is the physical movement.
Describe Conservation of Mass.
No matter how many times energy is moved from one store to another, the amount of energy remains the same.
Give the equation for Specific Heat Capacity.
Energy = Mass x SHC x Temperature Change
Give the definition of Specific Heat Capacity.
The amount of heat energy required to raise 1kg of a substance by 1°C.
What is the Gravitational Field Strength of Earth?
9.8N/Kg
Give one reason why having a low thermal conductivity can be effective.
Low thermal conductivity means less heat escapes.
Give one reason why we assume 100% efficiency when doing energy calculations.
To make calculations easier - UNLESS TOLD OTHERWISE
Describe Efficiency.
How much energy is usefully transferred from one object to another.
Give the equipment of the “Testing Insulators” required practical.
- Glass beaker
- Water
- Thermometer
- Assorted materials to insulate the beaker (e.g. bubble wrap or newspaper)
Give the independent variable of the “Testing Insulators” required practical.
Type of material placed over the glass beaker (the INSULATOR)
Give the dependent variable of the “Testing Insulators” required practical.
Temperature - thermometer MEASURES how well the material maintains the temperature.
