1
Q
What is the structure of most power stations?
A
- boiler uses fuel to produce heat to generate steam
- steam moves the blades of a turbine
- the rotating movement from the turbine is converted to electricity by the generator using electromagnetic conduction
2
Q
What are the advantages of different power sources?
A
- fossil fuels: readily available, concentrated source of energy
- biomass: renewable, process is carbon neutral overall, doesn’t need to be imported from other countries
3
Q
What are the disadvantages of different power sources?
A
- fossil fuels: burning causes acid rain and produces carbon dioxide a greenhouse gas, most fossil fuels we have a bought from other countries, so we have no control over the price and supply, finite and non-renewable
- biomass: lots of biomass required to replace one lump of coal, and it takes room to grow
4
Q
What is electromagnetic induction?
A
-the creation of a voltage (and maybe current) in a wire which is experiencing a change in magnetic field
5
Q
What is the dynamo effect?
A
-using electromagnetic induction to transform kinetic energy into electrical energy
6
Q
How can voltage and current produced be increased in the dynamo effect?
A
- strength of magnet
- number of turns on the coil
- speed of movement
7
Q
How do generators work?
A
- rotate a coil in a magnetic field
- every half turn the current in the coil swaps direction
- meaning an alternating current is produced
- frequency of AC electrical supplies is the number of cycles per second
8
Q
What are different types of energy sources?
A
- fossil fuels
- biomass
- photocells
- nuclear
- wind power
9
Q
What are some the situations where you get EM induction?
A
- an electrical conductor (coil of wire often used) moves through a magnetic field
- magnetic field through electrical conductors (gets bigger, smaller or reverses)
