Electric Grids and Power Systems Quiz

How many electric grids are there in North America?

• 2

• 4

• 6

• 8

What type of current system allows for changes in voltage?

• Direct current

• Alternating current

• Static current

• Pulsating current

Why is less energy lost with higher voltages?

• Higher voltages are more stable

• Higher voltages require less insulation

• Higher voltages are less dangerous

• Higher voltages are more efficient

What is the main source of energy for most power plants?

• Solar energy

• Wind energy

• Fossil fuels

• Nuclear energy

What percentage of energy is typically lost as heat in power plants?

• 50%

• 67%

• 75%

• 80%

What device is used to increase voltage at substations?

• Generator

• Transformer

• Capacitor

• Rectifier

To what voltage does a typical substation increase the voltage for long-distance travel?

• 100,000V

• 200,000V

• 300,000V

• 400,000V

What is the voltage reduced to before electricity enters homes?

• 1,200 volts

• 2,400 volts

• 7,200 volts

• 10,000 volts

What voltage does a transformer drum reduce the electricity to before it enters your home?

• 120 volts

• 240 volts

• 360 volts

• 480 volts

What enables you to use computers, hair dryers, and lights in your home?

• Solar panels

• Wind turbines

• Electricity delivery system

• Battery storage