Renewable and Non- Renewable Energy Sources

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What is an active solar heating system?

Back

A system that captures energy from the sun by pumping a heat-absorbing fluid, such as water or an antifreeze solution, through special collectors, usually mounted on a roof or on special racks that face the sun.

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What does energy efficiency measure?

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Energy efficiency measures how much useful work each unit of input energy provides.

Front

What is a hydrogen fuel cell?

Back

A device that uses hydrogen gas as a fuel to produce electricity when it reacts with oxygen gas in the atmosphere, emitting harmless water vapor.

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What is net energy?

Back

Net energy is the total amount of energy produced by a resource, and it is important because it determines the overall efficiency and usefulness of the resource.

Front

What is hydraulic fracturing?

Back

A method that uses pumps to blast huge volumes of a mixture of water, sand, and various chemicals into a well to fracture rock and release natural gas or oil.

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What is a photovoltaic cell system?

Back

A system that converts sunlight directly into electricity using semiconductor materials.

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What is passive solar heating?

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A method of capturing and using solar energy without mechanical devices, relying on building design and materials to collect and store heat.

Front

What is energy density?

Back

Energy density refers to the amount of energy stored in a given system or region of space per unit volume or mass.

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What is a wind turbine?

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A device that converts kinetic energy from the wind into mechanical energy, which can then be converted into electricity.

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What is geothermal energy?

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Energy derived from the heat stored beneath the Earth's surface, which can be used for heating and electricity generation.