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Energy Budgets

Energy Budgets

Organisms must balance energy intake with the energy required for growth, maintenance and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species, like annual plants, have only one reproductive episode in their lifetimes and consequently have short lifespans. Iteroparous species, by contrast, have many reproductive events during their lifetimes but have relatively few offspring. These two...

Electrical Energy

Electrical Energy

Using electric appliances for a longer period of time consumes more electrical energy and results in a higher electric bill. The energy produced by the transfer of electrons from one point to another is known as electrical energy. If power is delivered at a constant rate, the electrical energy can be defined as the product of power used by the device for a period of time. The energy unit on electric bills is the kilowatt-hour, where one kilowatt-hour is equivalent to 3.6 × 106 joules.

Trophic Efficiency

Trophic Efficiency

Trophic level transfer efficiency (TLTE) is a measure of the total energy transfer from one trophic level to the next. Due to extensive energy loss as metabolic heat, an average of only 10% of the original energy obtained is passed on to the next level. This pattern of energy loss severely limits the possible number of trophic levels in a food chain.

Production Efficiency

Production Efficiency

Net production efficiency (NPE) is the efficiency at which organisms assimilate energy into biomass for the next trophic level. Due to low metabolic rates and less energy spent on thermoregulatory processes, the NPE of ectotherms (cold-blooded animals) is 10 times higher than endotherms (warm-blooded animals).

Conservation of Energy: Application

Conservation of Energy: Application

When solving problems using the energy conservation law, the object (system) to be studied should first be identified. Often, in applications of energy conservation, we study more than one body at the same time. Second, identify all forces acting on the object and determine whether each force doing work is conservative. If a non-conservative force (e.g., friction) is doing work, then mechanical energy is not conserved. The system must then be analyzed with non-conservative work. Third, for...

Energy Conservation and Bernoulli's Equation

Energy Conservation and Bernoulli's Equation

Applying the conservation of energy principle or the work-energy theorem to an incompressible, inviscid fluid in laminar, steady, irrotational flow leads to Bernoulli's equation. It states that the sum of the fluid pressure, potential, and kinetic energy per unit volume is constant along a streamline.
All the terms in the equation have the dimension of energy per unit volume. The kinetic energy per unit volume is called the kinetic energy density, and the potential energy per unit volume is...

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Related Experiment Video

Updated: Sep 28, 2025

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice

Published on: November 11, 2021

Estimating the energy consumption function: evidence from across the globe.

Muhammad Azam^1,2, Ali Gohar¹, Festus Victor Bekun^3,4,5

¹Department of Economics, Faculty of Business & Economics, Abdul Wali Khan University Mardan, Mardan, Khyber Pakhtunkhwa, Pakistan.

Environmental Science and Pollution Research International

|April 5, 2022

Summary

Economic growth, urbanization, and carbon emissions significantly drive global energy consumption. Policies must balance economic development with environmental quality to achieve sustainable development goals.

Keywords:

CO2 emissions Carbon reduction Economic growth Responsible energy consumption SDGs Sustainability

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Last Updated: Sep 28, 2025

Determining Basal Energy Expenditure and the Capacity of Thermogenic Adipocytes to Expend Energy in Obese Mice

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Published on: November 11, 2021

Measuring Light-Switching Behavior Using an Occupancy and Light Data Logger

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Determining the Contribution of the Energy Systems During Exercise

Determining the Contribution of the Energy Systems During Exercise

Published on: March 20, 2012

Area of Science:

Environmental Science
Economics
Sustainable Development

Background:

Global energy demand has significant environmental consequences due to anthropogenic effects.
Achieving United Nations Sustainable Development Goals (UN-SDGs), including clean energy (SDG-7) and responsible consumption (SDG-12), is crucial for sustainable economic growth and environmental sustainability.
Addressing climate change mitigation (SDG-13) is essential.

Purpose of the Study:

To identify the key factors determining the energy consumption function across 79 global economies.
To analyze energy consumption patterns in five major world regions over 44 years.

Main Methods:

A multivariate regression model was employed.
The method of least squares was utilized for empirical investigation.
Analysis covered 44 years of data from Asia and Pacific, Europe, Africa, Latin America, and the Middle East and Arab States.

Main Results:

Economic growth, urbanization, and carbon emissions were identified as the primary determinants of energy consumption.
Regional and country-specific least squares results showed no significant differences, indicating common drivers.
A consistent narrative emerged across regions regarding the factors influencing energy consumption.

Conclusions:

Energy consumption is significantly influenced by economic growth, urbanization, and carbon emissions.
Energy policies should integrate economic growth considerations with environmental quality objectives.
Aligning energy policies with these factors is vital for achieving sustainable development goals.