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Related Concept Videos

Biofuels01:25

Biofuels

The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
What is Energy?04:10

What is Energy?

The universe is composed of matter in different forms, and all forms of matter contain energy.  The different forms of energy on Earth originate from the Sun — the ultimate energy source. Plants capture light energy from the Sun, and, via the process of photosynthesis, convert it into chemical energy. This stored energy from plants can be harnessed in many ways. For example, eating plant products as food provides energy for our body to function, and burning wood or coal (fossilized plants)...
Green Algae01:21

Green Algae

Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
Power and Energy01:12

Power and Energy

The power and energy delivered to an element are subjects of great significance in the field of electrical engineering. It is a well-known fact that a 100-watt light bulb emits more light than a 60-watt one. Therefore, power and energy calculations play a crucial role in the analysis of electrical circuits.
Power, defined as the time rate of expending or absorbing energy, is quantified in units called watts (W). The relation between power and energy is mathematically given as
Batteries and Fuel Cells03:12

Batteries and Fuel Cells

A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
AC Sources01:20

AC Sources

Direct current is a flow of electric charge in only one direction and has a steady state of constant voltage in the circuit. Rectifiers, batteries, commutator-equipped generators, and fuel cells are some examples of devices that generate direct current. Nowadays, most applications use a time-varying voltage source. Alternating current is a flow of electric charge that periodically reverses direction. An alternating current is produced by an alternating emf that is generated in a power plant. If...

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Looking for alternative energy sources.

Michael Gross

    Current Biology : CB
    |April 3, 2012
    PubMed
    Summary
    This summary is machine-generated.

    Global energy security is a growing concern due to geopolitical instability and challenges with renewable energy sources. Urgent development of sustainable energy alternatives is needed to avoid reliance on non-renewable fossil fuels.

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    Area of Science:

    • Energy Security
    • Sustainable Energy Solutions
    • Geopolitics of Energy

    Background:

    • 2011 events, including oil-exporting country unrest, anti-biofuel/photovoltaic sentiments, and the Fukushima nuclear incident, eroded confidence in energy supply stability.
    • The urgent need for alternative energy sources is highlighted by global events.
    • Current investigations into energy alternatives sometimes revert to unsustainable fossil fuel options.

    Purpose of the Study:

    • To underscore the urgency of developing reliable and sustainable energy alternatives.
    • To critically assess the direction of current energy research and development.
    • To advocate for truly novel and sustainable energy solutions.

    Main Methods:

    • Analysis of global energy market trends and geopolitical factors.
    • Review of recent technological advancements and setbacks in renewable energy (biofuels, photovoltaics).
    • Examination of public and political reactions to different energy sources.

    Main Results:

    • Global energy supply confidence was significantly shaken in 2011.
    • Renewable energy technologies faced significant public and political challenges.
    • A concerning trend of revisiting fossil fuel reliance exists despite sustainability goals.

    Conclusions:

    • The global energy landscape in 2011 necessitated a more urgent and innovative approach to energy solutions.
    • A critical re-evaluation of energy research is required to ensure a shift towards genuinely sustainable and secure energy futures.
    • Avoiding a return to unsustainable fossil fuel dependence is paramount for long-term energy security.