p8.2

Question 1

renewable energy sources

Answer 1

biofuels
sun
tides
wind
waves
hot rocks beneath ground
water high up behind dams

Question 2

non renewable

Answer 2

nuclear fuels
fossil fuels

Question 3

main uses of energy sources

Answer 3

heating
transportation
generating electricity

Question 4

heating sources

Answer 4

fossil fuels
biofuels
sun
water pumped into hot rocks

Question 5

transportation sources

Answer 5

fossil fuels
biofuels

Question 6

generating electricity

Answer 6

fossil fuels
biofuels
nuclear fuels
solar power
tidal power
wind power
wave power
geothermal power
hydroelectric power

Question 7

issues/ things needing to be considered with energy supply

Answer 7

cost to set up /remove
effect on environment
contribution to climate change
how long sources last

Question 8

what is the national grid

Answer 8

power stations , transformers, grid network , substations all make up the national grid which provides electricity to homes

Question 9

how are transformers used in the national grid

Answer 9

transformers change p.d to reduce heating effect
this makes the national grid efficient

Question 10

what is mains or domestic supply

Answer 10

mains voltage or p.d which is 230 V
generators in power stations produce alternating p.d with frequency of 50Hz

Question 11

live wire and neutral wire

Answer 11

live wire (brown)
neutral wire (blue)
two wires that complete the circuit with an applicable

Question 12

earth wire

Answer 12

green and yellow
not connects to mains
connected to the earth
(large metal pole buried in the ground outside your house)

Question 13

why à live wire may be dangerous even when an appliance isn’t switched on

Answer 13

if loose can touch metal casing
casing has p.d of 230 V
dangerous current can flow through