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Related Concept Videos

Electrical Energy01:10

Electrical Energy

Using electric appliances for a longer period of time consumes more electrical energy and results in a higher electric bill. The energy produced by the transfer of electrons from one point to another is known as electrical energy. If power is delivered at a constant rate, the electrical energy can be defined as the product of power used by the device for a period of time. The energy unit on electric bills is the kilowatt-hour, where one kilowatt-hour is equivalent to 3.6 × 106 joules. The...
Power and Energy01:12

Power and Energy

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
Power01:08

Power

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,...
Average Power01:13

Average Power

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.
Energy and Power Signals01:17

Energy and Power Signals

In an electrical system with a resistor, voltage and current signals facilitate the measurement of power and energy across the resistor. For a continuous-time signal, the total energy over a time interval is defined as the integral of the square of the signal's magnitude over that interval. Mathematically, this is expressed as:
Power System Distribution01:25

Power System Distribution

Power system distribution involves delivering electrical energy from power plants to consumers through a network of transmission and distribution systems. The process begins at power plants, where energy from coal, gas, nuclear, water, and wind is converted into electrical energy. These plants use three-phase generators, typically rated between 50 to 1300 MVA, with terminal voltages ranging from a few kV to 20 kV, depending on the size and age of the units.
The transmission system is designed...

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Related Experiment Video

Updated: Jun 11, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
10:17

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

Power-by-light systems and their components: an evaluation.

M J Landry, J W Rupert, A Mittas

    Applied Optics
    |June 29, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates efficient power-by-light (PBL) systems for energy transfer across barriers. Optimized components achieved 5.5% system efficiency, with potential for 12% in future power delivery applications.

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    Using Affordable LED Arrays for Photo-Stimulation of Neurons
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    Published on: November 15, 2011

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    Last Updated: Jun 11, 2026

    20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
    10:17

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    Published on: July 12, 2017

    Using Affordable LED Arrays for Photo-Stimulation of Neurons
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    Using Affordable LED Arrays for Photo-Stimulation of Neurons

    Published on: November 15, 2011

    Area of Science:

    • Optoelectronics
    • Energy Transfer Systems

    Background:

    • Power-by-light (PBL) technology enables wireless energy transfer across physical barriers.
    • Efficient energy conversion and transmission are critical for practical PBL applications.

    Purpose of the Study:

    • To test and evaluate small-scale power-by-light systems and their components.
    • To assess the efficiency of energy transfer across a barrier using optimized PBL components.

    Main Methods:

    • Utilized high-power laser diodes, large numerical aperture fibers, high-efficiency solar cells, and DC-DC converters.
    • Measured continuous laser diode power output (up to 3.6 W) and light-to-electrical power conversion efficiency (46%) of solar cells.
    • Evaluated system efficiency for 100-mJ and 220-mJ PBL systems charging capacitors.

    Main Results:

    • Laser diodes converted ~40% of electrical power to light; fibers transmitted up to 92% of incident energy.
    • Solar cells achieved 46% light-to-electrical conversion efficiency with an 89% fill factor.
    • System efficiencies of 3.4% and 5.5% were achieved for 100-mJ and 220-mJ systems, respectively.

    Conclusions:

    • Optimized components significantly enhance PBL system performance.
    • Current PBL systems demonstrate practical energy transfer capabilities.
    • Future improvements are projected to reach 12% system efficiency, enabling wider applications.