Electrical Supply Systems

What are the three main components of the electricity supply industry?

• Generation, transmission, distribution

• Power stations, transformers, sub-stations

• Fossil fuels, hydro, nuclear

• Overhead power lines, insulators, pylons

Why are power stations often sited close to the fuel source and other important resources?

• To reduce I2R losses

• To ensure greater security of supplies

• To enable maintenance operations

• To connect power stations and load centres

What is the purpose of the National Grid in Great Britain?

• To generate electricity

• To transmit electricity at high voltages

• To distribute electricity to consumers

• To connect power stations and major sub-stations

Why is transmission carried out at high voltages?

• To reduce I2R losses

• To ensure greater security of supplies

• To enable maintenance operations

• To connect power stations and load centres

What are the three transmission voltages used in the UK?

• 132kV, 275kV, 400kV

• 25kV, 66kV, 230V

• 33kV, 11kV, 400V

• 25kV, 275kV, 132kV

What are the main components of the electrical distribution network?

• Sub-stations, pylons, power stations

• Cables, insulators, transformers

• Overhead power lines, insulators, pylons

• Fossil fuels, hydro, nuclear

What are the three distribution voltages used in the UK?

• 33kV, 11kV, 400V

• 132kV, 275kV, 400kV

• 25kV, 66kV, 230V

• 25kV, 275kV, 132kV

What is the voltage used for domestic users in the UK?

• 400V

• 230V

• 33kV

• 11kV