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Related Concept Videos

Power01:08

Power

12.4K
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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Power in an AC Circuit01:26

Power in an AC Circuit

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In a DC circuit, the power consumed is simply the product of the DC voltage times the DC current, given in watts. However, the power consumed for AC circuits with reactive components is calculated differently. Since electrical power is the "rate" at which energy is used in a circuit, all electrical and electronic components and devices have a safe operating range for electrical power.
In a DC circuit, there is no sinusoidal waveform associated with the supply; the voltages and currents are...
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Power and Energy01:12

Power and Energy

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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
1.6K
Power in a Three-Phase Circuit01:15

Power in a Three-Phase Circuit

497
Three-phase systems have two configurations: the wye and delta. A star configuration can be three or four wires; in a delta configuration, the components are connected in a closed loop. Instantaneous power refers to the power value at a precise moment, and in a balanced three-phase system, it is constant. This is because the sum of the instantaneous powers in the three phases remains steady over time, despite individual fluctuations, due to the symmetry and phase relationship. The total...
497
Instantaneous Power01:22

Instantaneous Power

704
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.
704
Complex Power01:14

Complex Power

697
Power engineers have introduced the concept of complex power to determine the cumulative effect of parallel loads. This idea plays a crucial role in power analysis because it encompasses all the details related to the power consumed by a specific load.
Complex power is defined as the multiplication of the voltage and the complex conjugate of the current. The magnitude of this power, known as apparent power, is measured in volt-amperes (VA). Notably, the angle of the complex power equates to the...
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Related Experiment Video

Updated: Nov 24, 2025

Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion
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Thoughts About Power.

Jacqueline Fawcett1, Yao Zhang1

  • 1Department of Nursing, University of Massachusetts Boston, Boston, MA, USA.

Nursing Science Quarterly
|December 22, 2020
PubMed
Summary

This essay explores diverse perspectives on power, including nursing theories and the medicalization of care. It contrasts negative, control-based power with positive approaches that emphasize empowerment over control.

Area of Science:

  • Sociology of Health and Illness
  • Nursing Theory
  • Philosophy of Medicine

Background:

  • Power dynamics are central to healthcare interactions.
  • Understanding different conceptualizations of power is crucial in nursing and patient care.
  • The medicalization of patient care influences perceptions and experiences of power.

Purpose of the Study:

  • To discuss various perspectives on power.
  • To examine power within nursing conceptual models and theories.
  • To analyze the role of medicalization in patient care power dynamics.

Main Methods:

  • Literature review of dictionary definitions of power.
  • Analysis of power within nursing conceptual models.
  • Exploration of nursing theories of power.
Keywords:
nursing theoriespowerpower as controlpower as freedompower as peace

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  • Discussion of the medicalization of patient care.

    • Main Results:

    • Multiple perspectives on power exist, ranging from dictionary definitions to complex theoretical frameworks.
    • Nursing conceptual models and theories offer distinct views on power.
    • The medicalization of patient care introduces specific power dynamics.
    • A key contrast emerges between control-based (negative) and empowerment-based (positive) power.

    Conclusions:

    • Power in healthcare is multifaceted, influenced by theoretical, practical, and societal factors.
    • Recognizing the dichotomy between control and empowerment is essential for ethical and effective patient care.
    • Further exploration of positive power paradigms can enhance nursing practice and patient outcomes.