How Electricity is Supplied

It is beneficial to use transformers to produce high voltages for energy transmission in order to:

• increase the speed of energy transmission

• reduce the size of transmission line conductors

• allow the use of less expensive insulating materials

• increase the power generated

Which voltage is used in the transmission of electrical energy via the super grid

• 132kV

• 275kV

• 11kV

• 400kV

Which one of the following methods of generating electricity

uses fossil fuels?

• Wave power

• Solar

• Gas

• Wind

Which one of the following uses sunlight to generate electricity?

• Photo-voltaic

• Biomass

• Wind

• Air source heat pump

Which of the following is a transmission voltage?

• 400kV

• 33kV

• 11kV

• 400V

Which one of the following is a typical distribution voltage for a medium-sized factory

where a private sub station is located?

• 230V

• 400V

• 5kV

• 11kV

In which of the following parts of the electrical distribution network

would a step-down transformer be located?

• Power station

• Pylon

• Local distribution sub station

• Inverter

Which one of the following describes the process

of a solar photo voltaic system?

• Solar power is used to ignite a biomass which heats up water

• Solar power is collected by a solar panel which produces electricity

• Solar power is collected by a solar panel which provides hot water

• Solar power causes hot air to rise, rotating a generator that produces electricity

What is the purpose of the National Grid:

• Transmission of electricity from power stations to industrial locations.

• Transmission of electricity from power stations to substations.

• Transmission of electricity from sub stations to domestic premises.

• Transmission of electricity from power stations to factories.

Which one of the following types of power stations do not use a fossil fuels

to generate electricity:

• nuclear

• coal fired

• gas fired

• oil fired