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Related Concept Videos

Power01:08

Power

13.0K
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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Heating and Cooling Curves02:44

Heating and Cooling Curves

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When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
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Acid-Base Titration Curves02:23

Acid-Base Titration Curves

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A titration curve is a plot of some solution property versus the amount of added titrant. For acid-base titrations, solution pH is a useful property to monitor because it varies predictably with the solution composition and, therefore, may be used to monitor the titration’s progress and detect its endpoint. Acid-base titration can be performed with a strong acid and a strong base, a strong acid and a weak base, or a strong base and a weak acid.
For a titration carried out for 25.00 mL of...
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Instantaneous Power01:22

Instantaneous Power

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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

Complex Power

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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

Electrical Power

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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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Related Experiment Video

Updated: Feb 1, 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

536

[Power curves in rhinomanometry].

J Eichler

    Biomedizinische Technik. Biomedical Engineering
    |March 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

    New analysis of nasal breathing measurements reveals lost information in standard rhinomanograms. Deriving respiration power and mean airflow from transnasal pressure and volume flow offers a more complete diagnostic picture.

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    Measurement of the Pressure-volume Curve in Mouse Lungs
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    Area of Science:

    • Otorhinolaryngology
    • Allergology
    • Respiratory Physiology

    Context:

    • Nasal breathing is evaluated using transnasal pressure (ΔP) and volume flow (V) measurements.
    • Current methods, like rhinomanometry, may lose critical diagnostic information.
    • Standard rhinomanograms represent complex breathing dynamics simplistically.

    Purpose:

    • To propose a novel method for analyzing nasal breathing data.
    • To recover lost information from standard transnasal pressure and volume flow measurements.
    • To enhance diagnostic capabilities in nasal and allergy evaluations.

    Summary:

    • Transnasal pressure (ΔP) and volume flow (V) during breathing are measured.
    • Information loss occurs when these measurements are solely represented as a rhinomanogram.
    • The study proposes deriving respiration power and mean volume flow from these measurements.
    • Respiration power can be functionally represented against mean airflow for variable breathing amplitudes.

    Impact:

    • Offers a more comprehensive understanding of nasal airflow dynamics.
    • Suggests a simple software modification to existing rhinomanometers for enhanced analysis.
    • Potentially improves diagnostic accuracy in conditions affecting nasal airflow and allergy.