Energy Transfers Flashcards
What is internal energy?
The energy stored in the movement of the particles
What unit is energy measured in?
Joules (J)
What is internal energy also called?
Thermal/heat energy
What does the amount of internal energy stored in something depend on?
- it’s temperature
- material it’s made from
- it’s mass
What are examples of energy transfers?
Heat/light/electric/sound/force
What is energy?
The ability to do work
How is energy transferred from hot objects?
By radiation
What is conduction?
Way of transferring energy through solids
What is an insulator?
A material/substance that does not allow heat or sound to pass through it
What is a conductor?
Material/substance that allows electricity to flow through it
1 Watt=?
1 Watt=1 joule transferred every second
1000 W=?
1000 W=1kW
What is efficiency?
The ability to avoid wasting materials
How can we show energy transfers?
Sankey diagram
What is the equation for efficiency?
Efficiency= useful energy transferred (over)
Total energy supplied. X100
