2.7 Flashcards
1
Q
what is energy used for in our home?
A
for heating and to power electrical appliances
2
Q
what is power
A
the rate at which the energy is transferred in an electrical appliance
3
Q
what do energy labels help consumers do?
A
work out which appliances are most efficient and cost-effective
4
Q
what is energy measured in?
A
joules
5
Q
1 watt = how many joules per second?
A
1
6
Q
power (watts) =
A
potential difference (volts) X current (amps)
7
Q
different electrical appliances in the home
A
power (kw) (w) = energy transferred (kw/h) (j) divided by time (h)(s)
8
Q
what does efficiency mean?
A
amount of energy supplied to a device that is transferred into useful energy
