Energy Efficiency Flashcards
Name two ways in which a television transfers useful energy to its surroundings
Light sound
Name one way in which a television transfers wasted energy to its surroundings
By heating
In what way do most machines or processes transfer wasted energy to the surroundings
By heating
Name two machines in which energy transferred by heating is useful energy
Cooker or fire
When a kettle boils water , the useful energy ends up stored as thermal energy in the hot water where does the wasted energy end up
Thermal energy in the kettle
When a moving care brakes and comes to a stop where does all the kinetic energy it was storing eventually end up
Thermal energy in the surroundings
When a moving car hits a wall what happens to the kinetic energy it was originally storing
Transferred to surroundings by sound
What does dissipated mean
Spread out
Why is wasted energy transferred by heating no longer useful
It is too spread out
Which wastes more energy an more efficient Mach or a less efficient machine
Less efficient
What does efficiency mean
A way of saying how much energy something wastes. A more efficient machine wastes less energy.
Lubrication
To reduce friction by putting a substance between 2 surfaces
