Phase 3 9189 Electrical PP2

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

• To decrease the voltage for safe household use

• To increase the electromotive force (voltage) to enable current to travel through the distribution network

• To generate electricity from fossil fuels

• To convert solar energy into electrical energy

What is the electromotive force increased to by the transformer for the current to travel through the distribution network?

• 22,000 volts

• 275,000 volts

• 400,000 volts

• 500,000 volts

Which of the following is not a source of renewable energy listed in the image?

• Solar

• Wind

• Oil

• Hydro/waves

According to the image, which component in the power station supplies DC current to the electromagnet?

• Power station

• Turbine

• Generator

• Brushes

Why does electricity need to be transmitted at very high voltages?

• To increase the energy consumption

• To make it safer for residential areas

• To compensate for power loss through power lines

• To reduce the cost of electricity

What are the two voltages mentioned for the supergrid in the distribution network?

• 400kV and 230kV

• 275kV and 132kV

• 400kV and 275kV

• 230kV and 33kV

What is the typical voltage for distribution in a large/commercial building?

• 400V

• 230V

• 132kV

• 33kV

What is the typical voltage for distribution in domestic dwellings?

• 400V

• 230V

• 132kV

• 33kV

What does the National Grid use to transform the electrical supply down from high voltage to lower voltage levels?

• Radial circuits

• Local sub-stations

• Supply transformers

• Underground supply

After the National Grid transforms the electrical supply down to 11kV, what is the next step in the distribution process?

• The supply is distributed directly to customers

• The supply is transformed down to 400V at local sub-stations

• The supply is transformed up to 132kV

• The supply is transmitted via the Supergrid