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AQA Science B Unit 2 > 2.7 > Flashcards

Flashcards in 2.7 Deck (8):
1

what is energy used for in our home?

for heating and to power electrical appliances

2

what is power

the rate at which the energy is transferred in an electrical appliance

3

what do energy labels help consumers do?

work out which appliances are most efficient and cost-effective

4

what is energy measured in?

joules

5

1 watt = how many joules per second?

1

6

power (watts) =

potential difference (volts) X current (amps)

7

different electrical appliances in the home

power (kw) (w) = energy transferred (kw/h) (j) divided by time (h)(s)

8

what does efficiency mean?

amount of energy supplied to a device that is transferred into useful energy