9189 Electrical Powerpoint 2

What is the role of a transformer in the electrical generation process?

• It decreases the electromotive force.

• It increases the electromotive force.

• It converts AC to DC.

• It generates electricity from fossil fuels.

From what voltage to what voltage does the transformer increase the electromotive force?

• From 22,000 volts to 275,000 volts.

• From 22,000 volts to 400,000 volts.

• From 22,000 volts to 500,000 volts.

• From 22,000 volts to 300,000 volts.

What causes the current to flow in the electrical generation process?

• The generator.

• The turbine.

• The electromotive force.

• The power station.

What is the purpose of transmitting electricity at very high voltages?

• To reduce the cost of electricity

• To compensate for power loss through power lines

• To increase the speed of electricity transmission

• To reduce the size of power lines

What are the voltage levels of the supergrid mentioned in the document?

• 132kV and 33kV

• 400kV and 275kV

• 11kV and 400V

• 275kV and 132kV

What is the typical voltage for distribution in large commercial buildings?

• 11kV

• 33kV

• 400V

• 230V

What is the typical voltage for distribution in domestic dwellings?

• 11kV

• 33kV

• 400V

• 230V

What is the role of sub-stations in the National Grid?

• To generate electricity

• To transform the electrical supply down to 11kV and distribute it to local sub-stations

• To distribute electricity directly to homes

• To store electricity for future use

At what voltage is electricity finally distributed to customers via a network of radial circuits?

• 400V

• 11kV

• 132kV

• 33kV

What is the typical voltage for a large commercial building?

• 230V

• 400V

• 11kV

• 132kV