energy transfer Flashcards
1
Q
what is energy
A
the ability to do work
2
Q
what is work
A
transfer of energy
3
Q
what is a system
A
an orbject or a group of objects
when a system changes energy is transferred
4
Q
how is energy transferred
A
- direct heating
- waves/radiation
- electrical current
- force when it moves an object (mechanically)
5
Q
what is law of conservation of energy
A
energy can not be created or destroyed only transferred usefully, stored or dissipated
- some energy transfers are useful some are wasted
