More cards in this set

Card 6

Front

When was the first turbine made?

Back

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Card 7

Front

When was the first natural gas well dug?

Back

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Card 8

Front

When was the first oil well built?

Back

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Card 9

Front

When was the first power plant built?

Back

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Card 10

Front

When was the first gasoline fuelled car made?

Back

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Card 11

Front

What percentage of the energy in a house is lost through the windows?

Back

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Card 12

Front

What is the optimum speed for most vehicles?

Back

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