P8 - global challenges Flashcards
what is a circuit breaker?
an electrical switch designed to protect an electrical circuit from damage
what is an earth wire?
a safety wire that stops the appliance becoming live
what is a fuse?
thin wire that melts if current too high
what is an iron core?
the main structure of the transformer that links the alternative magnetic field from the primary coil to the secondary coil
what is a live wire?
carries high voltage (230V)
what is the national grid?
the power stations, wires, pylons an transformers that supply electricity to everyone in the UK
what is a neutral wire?
completes the circuit
what does non-renewable mean?
energy sources that will run out
what is a primary coil?
the wire carrying the current to the transformer
what does renewable mean?
energy sources that will not run out (in the next million years or so)
what is resistance?
a measure of how easy it is for current to flow
what is a secondary coil?
the wire carrying the current away from the transformer
what is a step-down transformer?
decreases the p.d. from primary coil to secondary coil back to safer levels; located near to homes
what is a step-up transformer?
increases p.d. from primary to secondary coils; located next to power station; used to reduce heating losses in the national grid
what are the main energy resources?
- fossil fuels (coal, oil and gas)
- nuclear fission
- solar
- hydroelectricity
- wind
- tidal
- biofuels
are fossil fuels renewable or non-renewable?
non-renewable
is nuclear fission renewable or non-renewable?
non-renewable
is solar renewable or non-renewable?
renewable
is hydroelectricity renewable or non-renewable?
renewable
is wind renewable or non-renewable?
renewable
is tidal renewable or non-renewable?
renewable
are biofuels renewable or non-renewable?
renewable
what type of energy store do fossil fuels have?
chemical
what type of energy store does nuclear fission have?
nuclear