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Related Concept Videos

Power01:08

Power

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The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
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Average Power01:13

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In practical electrical applications, the concept of time-varying instantaneous power is not frequently utilized. Instead, focus shifts to the more practical quantity known as average power. Average power is determined by integrating the instantaneous power over a specified time period and subsequently dividing it by that duration.
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Instantaneous Power01:22

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Instantaneous power is important in electrical circuits, mainly when dealing with sinusoidal input. Instantaneous power, denoted as p(t), results from the multiplication of the instantaneous voltage (v(t)) across an element and the instantaneous current (i(t)) flowing through it. This relationship adheres to the passive sign convention and represents a fundamental principle in electrical engineering.
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Power and Energy01:12

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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
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Power Expended by a Constant Force00:57

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The relationship between work done and the time taken to do it can be explained using the concept of power. For example, several sprinters in a race may have the same velocity when they reach the finish line, therefore doing the same amount of work, but the winner does it in the least amount of time. Thus, power is defined as the rate of doing work. Since work can vary as a function of time, the average power is defined as the work done during a time interval, divided by the time interval.
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Electrical Power01:07

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Electric power is the product of current and voltage, represented in units of joules per second, or watts. For example, cars often have one or more auxiliary power outlets with which you can charge a cell phone or other electronic devices. These outlets may be rated at 20 amps and 12 volts, so that the circuit can deliver a maximum power of 240 watts. Consider a 25 Watt bulb and a 60 Watt bulb. The conversion of electrical energy produces heat and light, while the kinetic energy lost by the...
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Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion
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Power in everyday life.

Pamela K Smith1, Wilhelm Hofmann2

  • 1Rady School of Management, University of California, San Diego, La Jolla, CA 92093-0553; psmith@rady.ucsd.edu.

Proceedings of the National Academy of Sciences of the United States of America
|August 24, 2016
PubMed
Summary
This summary is machine-generated.

Power is common in daily life, with subjective feelings often stemming from changing social roles rather than stable traits. Interestingly, low power had greater effects than high power in this study.

Keywords:
ecological settingexperience samplingpositional powersocial rolessubjective feelings of power

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Area of Science:

  • Psychology
  • Social Psychology

Background:

  • Power dynamics are central to social interactions.
  • Understanding the everyday experience of power is crucial.

Purpose of the Study:

  • To investigate the prevalence, sources, and correlates of power in natural environments.
  • To examine the effects of both positional and subjective power on affect, cognition, and interpersonal relations.
  • To compare the effects of high versus low power.

Main Methods:

  • Experience-sampling methodology was employed.
  • Participants reported on power-relevant situations in their daily lives.

Main Results:

  • Power experiences were common, with nearly half reporting high-power positions.
  • Positional and subjective power were related but had distinct effects.
  • Subjective power arose more from situational role changes than stable individual differences.
  • Responsibility moderated power's effects.
  • Low power demonstrated stronger effects than high power.

Conclusions:

  • Power is a dynamic aspect of everyday life, influenced by situational roles.
  • The impact of low power is more significant than previously emphasized in research.
  • Future research should consider the nuanced effects of responsibility and power levels.