8.1-8.15 Energy-Forces doing work Flashcards
Can energy be created or destroyed
No
Energy cannot be created or destroyed but it can be what?
Transfered
What happens when a system changes?
Energy is transferred from one form to another
What is a closed system?
A closed system is a system that experiences no external forces
What happens to energy in a closed system?
.The total energy remains the same at all times
What is work done?
.This is when an external force transfers energy into a system
How is the energy of electric changed?
Chemical potential energy (stored in batteries) forms electric
How is the energy in heating changed?
.Electric transfers to thermal energy as work is done against the heating coils causing it to heat up
What is energy transferred equal to?
The work done
What rarely happens to energy?
100% transferred into the desired form
What is wasteful when they get hot?
Mechanical processes
What is the rate at which energy is transferred?
Power
What is 1 watt equal to?
1 joule per second
What is efficiency a measure of?
How much energy is not lost as waste
