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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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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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Complex Power01:14

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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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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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Sums of Power01:22

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In definite integration, Riemann sums approximate the area under a curve by dividing it into subintervals and summing the areas of rectangles. When these approximations follow predictable numerical patterns, such as arithmetic or polynomial sequences, sum formulas offer a more efficient and accurate way to compute the result. In particular, the sum of consecutive integers, squares, and cubes plays an essential role in simplifying these calculations, especially when dealing with uniform...
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Nuclear Power02:36

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Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
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Related Experiment Video

Updated: Feb 6, 2026

Construction of Constant-Load (Isotonic) and Constant-Velocity (Isokinetic) Torque-Velocity-Power Profiles In vivo for the Rat Plantar Flexors
07:44

Construction of Constant-Load (Isotonic) and Constant-Velocity (Isokinetic) Torque-Velocity-Power Profiles In vivo for the Rat Plantar Flexors

Published on: October 3, 2025

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Power in numbers.

Evelyne Vinet1, Eliza F Chakravarty2, Megan E B Clowse3

  • 1Divisions of Clinical Epidemiology and Rheumatology, McGill University Health Centre, Montreal, Québec, Canada.

Rheumatology (Oxford, England)
|August 24, 2018
PubMed
Summary
This summary is machine-generated.

Studying pregnancies in women with rheumatic disease is challenging. Different research methods, from small case series to large databases, offer unique insights into maternal and child health outcomes.

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Area of Science:

  • Rheumatology
  • Obstetrics
  • Epidemiology

Background:

  • Pregnancy in women with rheumatic disease presents unique challenges for data collection.
  • Early studies on lupus in pregnancy were limited by small sample sizes.
  • Evolving research methodologies have improved understanding of safety and treatment norms.

Purpose of the Study:

  • To review various methodologies used to study rheumatic disease in pregnancy.
  • To discuss the strengths, weaknesses, and potential biases of different study approaches.
  • To enhance the comprehensive understanding of rheumatic diseases during pregnancy.

Main Methods:

  • Analysis of small case series.
  • Prospective cohort studies by university-based experts.
  • Utilization of large administrative databases.

Main Results:

  • Initial small studies suggested significant risks for pregnancies in women with lupus.
  • Larger prospective cohorts demonstrated improved safety profiles and informed treatment standards.
  • Administrative databases allow study of diverse populations and long-term offspring outcomes.

Conclusions:

  • Each research method provides valuable, albeit distinct, data on rheumatic disease in pregnancy.
  • Understanding methodological strengths and biases is crucial for accurate interpretation.
  • A combination of approaches deepens the collective knowledge of rheumatic diseases in pregnancy.