power and efficiency Flashcards
1
Q
what is power and what is the unit
A
the rate of energy transfer
watt (W)
2
Q
what is efficiency
A
the proportion/ratio Of TOTAL INPUT energy/power that is converted USEFUL OUTPUT energy.
3
Q
what are ways to keep heat in a house
A
cavity walls double glazing etc reduce heat
3
Q
what is lost from buildings through conduction
A
Thermal energy is usually lose from buildings CONDUCTION (vibrations pass along particles in the walls/floor/roof/windows) transferring energy to the outside surroundings.
