18.2 Developing Energy Technologies

produces electrical energy chemically

• alternative energy

• fuel cell

• energy efficiency

• energy conservation

• ocean thermal energy conversion (OTEC)

energy sources that are still in development

• alternative energy

• fuel cell

• energy efficiency

• energy conservation

• ocean thermal energy conversion (OTEC)

includes lifestyle changes

• alternative energy

• fuel cell

• energy efficiency

• energy conservation

• ocean thermal energy conversion (OTEC)

produces electrical energy using the temperature difference between two layers of water

• alternative energy

• fuel cell

• energy efficiency

• energy conservation

• ocean thermal energy conversion (OTEC)

percentage of energy that does useful work

• alternative energy

• fuel cell

• energy efficiency

• energy conservation

• ocean thermal energy conversion (OTEC)

A hybrid car uses

• an efficient gasoline engine and an electric motor.

• an efficient gasoline engine and a fuel cell.

• a fuel cell and a solar cell.

• a photovoltaic cell and an electric motor.

Compared to washing clothes in warm water, washing clothes in cold water uses

• much more energy

• the same amount of energy  

• much less energy.

• a little more energy.

Hydrogen gas could be used as a fuel source in the future because it

• is abundant.   

• can be burned as fuel.

• is used in fuel cells.

• All options

OTEC works because water boils at low temperatures when

• in a high-pressure chamber.

• cooled in a vacuum chamber.

• under low pressure in a vacuum chamber.

• pumped from the ocean.

Which of the following is an example of cogeneration?       

• driving a fuel-efficient car

• using the waste heat from a furnace to power a steam turbine

• using ocean thermal energy conversion to run a turbine

• using tidal power to generate electricity