Electricity Demand and Power Systems

What is a key characteristic of electric grids regarding electricity supply and demand?

• They store large amounts of electricity for later use.

• Their supply must instantly match demand.

• They are less complex than water systems.

• They primarily use renewable energy sources.

Which two months typically show the highest electricity demand on an annual basis in the U.S.?

• March and September

• January and July

• April and October

• February and August

During a typical weekday in January, when does electricity usage in the U.S. generally experience its first peak?

• Around midnight

• In the late afternoon

• Around 7:00 AM

• In the early evening

In the Northwest United States, including Colorado, when does electricity demand typically peak during a weekday in July?

• Around 4:00 PM

• Around 6:00 PM

• Around 12:00 PM (noon)

• Around 8:00 AM

Which type of power plant is best suited to quickly respond to short peaks in electricity demand?

• Nuclear power plants

• Coal power plants

• Simple cycle natural gas power plants

• Advanced natural gas power plants

What is the approximate cost of lithium-ion batteries needed to store one day's worth of electricity for an average American household?

• $130

• $390

• $3,900

• $13,000

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How does the battery electric storage system at Fort Carson primarily operate to save costs?

• It generates its own electricity using solar panels during the day.

• It charges its batteries during the day and discharges them at night.

• It charges its batteries at night when electricity rates are low and discharges them during the day.

• It sells excess electricity back to the grid at a fixed rate.

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A Rivian R1T electric vehicle has a battery pack large enough to power an average American household for approximately how many days?

• 1.5 days

• 2.5 days

• 3.5 days

• 4.5 days

How does a pumped hydroelectric storage system like Cabin Creek generate electricity when demand is high?

• It uses solar panels to convert sunlight into electricity.

• It burns fossil fuels to power turbines.

• It releases water from an upper reservoir through turbines to a lower reservoir.

• It pumps water from a lower reservoir to an upper reservoir.

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How does increasing voltage affect electricity loss during transmission?

• It increases the amount of electricity lost.

• It decreases the amount of electricity lost.

• It has no significant effect on electricity loss.

• It only affects the current, not the loss.

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