Why does energy demand increase as populations grow?

• Increased industrial activities

• More efficient energy use

• Decrease in population density

• Reduction in energy prices

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How do turbines generate electricity?

• Turbines convert chemical energy into electrical energy.

• Turbines convert mechanical energy into electrical energy.

• Turbines store electrical energy for later use.

• Turbines convert electrical energy into mechanical energy.

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What is a fuel cell?

• A substance that is used to produce heat or power, typically by burning.

• A device that stores electrical energy.

• A renewable source of energy.

• A type of energy that cannot be replenished.

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Which elements are found in organic fuels?

• Oxygen and nitrogen

• Carbon and hydrogen

• Sulfur and phosphorus

• Helium and neon

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What is an advantage and disadvantage of using fossil fuels?

• Fossil fuels are renewable and environmentally friendly.

• Fossil fuels are abundant and provide a stable energy source but contribute to pollution and climate change.

• Fossil fuels are expensive and difficult to transport.

• Fossil fuels are the only source of energy for transportation.

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What is the difference in energy needs between developed and developing countries?

• Developed countries have lower energy needs due to advanced technology.

• Developing countries have higher energy needs due to rapid industrialization.

• Developed countries have higher energy needs due to higher standards of living and industrial activities.

• Both have similar energy needs due to global energy policies.

Why is alternative energy more sustainable than fossil fuels?

• It is cheaper to produce.

• It is unlimited and has a lower environmental impact.

• It requires less technology to harness.

• It is more efficient in energy conversion.

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How is nuclear energy made?

• By burning uranium to produce heat.

• By splitting atoms in a process called fission to release energy.

• By combining hydrogen atoms in a process called fusion.

• By converting solar energy into electrical energy.

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What are the advantages and disadvantages of nuclear energy?

• It is renewable and produces no waste.

• It is efficient and produces large amounts of energy but has risks of radioactive waste and accidents.

• It is cheap and easy to produce.

• It is the most environmentally friendly energy source.

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How is solar energy harnessed?

• By using wind turbines to capture sunlight.

• By using photovoltaic cells to convert sunlight into electricity.

• By burning solar panels to produce heat.

• By using mirrors to reflect sunlight into space.

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