The cost of producing solar photovoltaic systems for residential applications has fallen by what percentage since the 1990s?

50%

10%

500%

80%

25%

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Question 6

1 pts

The case that holds the inner workings of a wind turbine is called the:

Nacelle

Tower

Gearbox

Hub

Generator

Question 7

1 pts

Which of the following is NOT a significant factor in the amount of electricity a wind turbine can generate?

Precipitation

Turbine height

Wind speed

Blade length

Geographic location

Question 8

1 pts

Which country has the largest market for wind energy in the world (as of 2012)?

China

Germany

United States

Ireland

Denmark

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Question 9

1 pts

Why is the market for wind energy in the United States so volatile?

Because the production tax credit used in the United States needs to be renewed every few years.

Because wind energy does not work well in the United States.

Because there is no area in the United States with good wind resources.

Because the feed-in tariff in the United States is too low.

Because of the recent financial crisis.

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Question 10

1 pts

Suppose that you were to double the length of a wind turbine’s blade. How much more electricity would that wind turbine generate (keeping the wind speed and other factors the same)?

Four times as much

Twice as much

Six times as much

Eight times as much