p7 - energy (from PMT) Flashcards
1
Q
describe the energy changes that occur in a filament light-bulb
A
-electrical energy is transferred into light and heat energy
-light is a useful energy form, heat is waste energy
2
Q
what unit of power is normally used for domestic electricity?
A
the kilowatt
3
Q
define power
A
the rate at which energy is transferred
4
Q
what is the unit of power
A
watt
5
Q
what is one watt equivalent to?
A
an energy transfer of 1 joule per second
