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Energy Basics02:27

Energy Basics

Chemical reactions, such as those that occur when you light a match, involve changes in energy as well as matter.
Energy00:58

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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. For instance, plants capture light energy from the Sun, and through 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...
Electrical Energy01:10

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. The...
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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.
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Bricks01:14

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Related Experiment Video

Updated: Jul 8, 2026

Design and Construction of an Urban Runoff Research Facility
13:48

Design and Construction of an Urban Runoff Research Facility

Published on: August 8, 2014

Energy and labor in the construction sector.

B Hannon, R G Stein, B Z Segal

    Science (New York, N.Y.)
    |November 24, 1978
    PubMed
    Summary

    This study used an energy input-output model to analyze construction industry energy use and employment. Findings show that optimizing building materials and considering lifetime energy costs can reduce construction energy consumption by 20%.

    Area of Science:

    • Environmental Science
    • Economics
    • Engineering

    Background:

    • The construction industry is a significant contributor to national energy consumption.
    • Understanding energy use and employment patterns is crucial for economic and environmental planning.

    Purpose of the Study:

    • To investigate the energy and employment impacts of the construction industry using an energy input-output model.
    • To determine the effect of construction activities on national energy consumption.
    • To analyze energy use and employment patterns within different construction categories.

    Main Methods:

    • Utilized an energy input-output model encompassing nearly 400 industrial sectors.
    • Analyzed data from 1967 to assess national energy consumption and employment.

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  • Examined energy intensity of building materials and lifetime energy costs.

    • Main Results:

    • Construction activities significantly impact total national energy consumption.
    • Identified patterns of energy use and employment across various construction categories.
    • Potential for a 20 percent reduction in total energy consumption for new building construction.

    Conclusions:

    • Selecting less energy-intensive materials and assemblies can decrease energy consumption.
    • Minimizing total lifetime energy costs of buildings is achievable through strategic energy expenditure during construction.
    • Energy conservation in supplying industries offers further reductions in construction's energy footprint.