Energy Exchange
Energy Exchange - Related Videos
11:38
Heat Exchanger Analysis
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2023
Source: Alexander S Rattner and Christopher J Greer; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, PA Heat exchangers transfer thermal energy between two fluid streams, and are ubiquitous in energy systems. Common applications include car radiators (heat transfer from hot engine coolant to surrounding air), refrigerator evaporators (air inside refrigerator compartment to evaporating refrigerant), and cooling towers in power plants...
02:27
Energy Basics
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2020
Chemical reactions, such as those that occur when you light a match, involve changes in energy as well as matter. Chemical changes and their accompanying changes in energy are important parts of everyday life. The macronutrients in food undergo metabolic reactions that provide the energy to keep bodies functioning. A variety of fuels (gasoline, natural gas, coal) is burned to produce energy for transportation, heating, and the generation of electricity. Industrial chemical reactions use...
08:52
Energy and Work
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2023
Source: Ketron Mitchell-Wynne, PhD, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA This experiment demonstrates the work-energy principle. Energy is one of the most important concepts in science and is not simple to define. This experiment will deal with two different kinds of energy: gravitational potential energy and translational kinetic energy. Gravitational potential energy is defined as the energy an object...
02:06
Social Exchange Theory
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2020
We have discussed why we form relationships, what attracts us to others, and different types of love. But what determines whether we are satisfied with and stay in a relationship? One theory that provides an explanation is social exchange theory. According to social exchange theory, we act as naïve economists in keeping a tally of the ratio of costs and benefits of forming and maintaining a relationship with others (Rusbult & Van Lange, 2003). People are motivated to maximize the benefits...
02:00
Internal Energy
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2020
The total of all possible kinds of energy present in a substance is called the internal energy (U), sometimes symbolized as E. Suppose a system with initial internal energy, Uinitial, undergoes a change in energy (transfer of work or heat), and the final internal energy of the system is Ufinal. Change in internal energy equals the difference between Ufinal and Uinitial. Although the values for Ufinal and Uinitial cannot be determined for a system, the first law of thermodynamics only...
FAQs
These pathways describe different ways energy moves between objects or systems. Work transfers energy through an interaction associated with physical action, while heat and radiation represent other transfer routes identified in physical analysis. Particle interactions provide a microscopic mechanism for exchange. Distinguishing the pathway helps researchers build an appropriate energy balance for the process being studied.
An isolated system provides a defined setting in which the total energy remains constant, even when energy changes form or moves among its components. This condition lets physicists separate internal redistribution from transfer across the system boundary. Applying it supports conservation-based predictions for processes involving motion, thermal behavior, reactions, or other physical changes.
Changes in energy form can alter the state and behavior of matter without violating conservation. Energy exchange contributes to processes such as thermal equilibrium and phase changes, where a system evolves toward a different physical condition. Tracking the changing forms helps connect what occurs at the system level with the observable outcome of the process.
An energy balance accounts for the energy entering, leaving, or changing form within the system under study. Combined with conservation laws, it provides a structured way to compare the system's behavior over time. Researchers use this accounting to predict outcomes, evaluate competing transfer pathways, and identify how physical processes alter the system.
Researchers apply conservation laws and energy balances to determine how energy moves through an engine or electrical device and how its form changes during operation. This analysis can reveal the relationship between inputs, transfers, and resulting behavior. It also supports efforts to improve technological efficiency by showing where the energy balance can be optimized.
The same conservation-based reasoning can be applied across very different physical scales. At microscopic scales, particle interactions help account for transfers and changes in form; at astronomical scales, energy balances help analyze large systems and their evolution. This broad applicability makes energy exchange a unifying framework within physics rather than a topic limited to laboratory devices.