• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
Enphase® Engage Cable
Enphase® Engage Cable

... The Engage Accessories complement the Engage Cable and give it the ability to adapt to any installation. ...
Homework 13B
Homework 13B

Info Letter No. 22 Definitions "Power factor" and "current
Info Letter No. 22 Definitions "Power factor" and "current

... for in order to avoid transmission losses. In an ideal case it is 1.0. Power supply companies often specify a power fact of at least 0.9 for their customers. If it is below this value, the related reactive work is billed separately. ...
Francis SP
Francis SP

Quattro Inverter/Charger
Quattro Inverter/Charger

... Three phase capability Three units can be configured for three phase output. But that’s not all: up to 6 sets of three units can be parallel connected to provide 162 kW / 180 kVA inverter power and more than 2500 A charging capacity. Quattro ...
life skills presentation
life skills presentation

... deliver a product far superior to earlier silicon versions. Power MOSFETs offer low on resistances (as compared to bipolar transistors), low voltage drops, low EMI, faster switching times and good thermal stability of key parameters. ...
Document
Document

... Differential-mode buck-boost inverters have merits such as reduced switch number, ability to provide voltages higher or lower than the input voltage magnitude, improved efficiency, reduced cost and size, and increased power density, especially in low-power applications. There are five buck-boost inv ...
Electromagnetic Weapon- ELECTROMAGNETIC BOMB
Electromagnetic Weapon- ELECTROMAGNETIC BOMB

Cables Lines, Design, Analysis and Simulation
Cables Lines, Design, Analysis and Simulation

... Flux to Simulink Technology Flux may be complemented by a direct co-simulation link with MATLAB Simulink. This coupling allows the user to benefit from both the capabilities of Flux for electromagnetic simulation and SIMULINK for the drive and control part. The simulation then accounts for saturation ...
Technology guide for power calculation
Technology guide for power calculation

... value of the pressure multiplied by the distance between the electrodes. It then increases for very low pressure. The variation of the disruptive voltage according to the pressure follows the Paschen law. It provides that for a breakdown to occur, shocks between gas molecules and electrons must caus ...
Electromagnetic induction
Electromagnetic induction

... 16. If you use a step-up transformer, how does the current in the secondary compare with the current in the primary? 17. If you wanted to repeat the nail melting experiment and your transformer had 600 turns on the primary, suggest how many turns there might be on the secondary. 18. Using the same ...
Network design documents
Network design documents

Application Note GaAs MMIC Based Control Components with Integral Drivers  Introduction
Application Note GaAs MMIC Based Control Components with Integral Drivers Introduction

... frequency. As we have discussed, the MESFET can be thought of as a voltage variable resistor. As the RF voltage swing gets high enough, it can counteract the DC bias level. If this happens, the resistance of the MESFET will change. If the MESFET is in its low resistance state, the increase in resist ...
Data Transmission Review
Data Transmission Review

... occur more frequently so that every computer on the network has more opportunities to transmit and receive data. 10. Packets may contain session-control codes, such as error correction, that indicate the need for a _________________________. 11. A packet's components are grouped into three sections: ...
TruePower Trio
TruePower Trio

S280-77-2
S280-77-2

... and cable, which connects to the power input jack. Battery operating life is approximately 4 hours (less under conditions of extreme heat or cold). It is used in applications where supply voltage is not readily available, such as remote substations or recloser line installations and interrogation of ...
Activity: Watt meters to test energy consumption
Activity: Watt meters to test energy consumption

... Energy = Power X time (kWh = watts/1000 X hours) Watt meters provide a convenient way to measure power consumption. Power consumption can also be determined through the appliance rating stamped on the appliance. For example, light bulbs are rated as “75 W” or “100 W” to indicate that they use more o ...
offline soft-switched led driver based on an integrated
offline soft-switched led driver based on an integrated

... converter and an AHB SRC. The goals of achieving high conversion efficiency, high PF, and low enough ripple on the output current were achieved, without the need for electrolytic capacitors in the power circuitry. The 92.4% global efficiency (PFC + PC) achieved with the prototype is fairly high when ...
The Ernitec Series 250 is a range of units capable of transmitting
The Ernitec Series 250 is a range of units capable of transmitting

components - Future Technology Worldwide
components - Future Technology Worldwide

paper handed in a prior year
paper handed in a prior year

... getting stepped down to either 208 VAC or 120 VAC for use by servers, lighting and more. Even though alternating current is pumped into the building and servers are plugged into standard alternating current, it is not the sole intermediary. Six or more conversions are required between AC and DC fro ...
Be the source: Deliverying current electricity
Be the source: Deliverying current electricity

... Real power lines may carry currents of more than a thousand Amperes. At a phase-to-earth voltage of 160 000V this implies a power of 480 000 000 W or 480 MW shared across 3 phases. If we use conductors in bundles, rather than singles, we can substantially increase the current a line can transmit. If ...
A Reconfigurable Low Power FPGA Design with
A Reconfigurable Low Power FPGA Design with

... attributes of flash-based FPGAs, you can ...
Proposed Title: Multi-Function Battery Energy Storage Systems
Proposed Title: Multi-Function Battery Energy Storage Systems

... Proceedings of the IEEE (Vol. 89, pp. 1744–1756). doi:10.1109/5.975900 Teleke, S., Baran, M. E., Huang, a Q., Bhattacharya, S., & Anderson, L. (2009). Control Strategies for Battery Energy Storage for Wind Farm Dispatching. IEEE Transactions on Energy Conversion, 24, 725–732. doi:10.1109/tec.2009.20 ...
AC POWER TRANSFER SWITCH PMTS-30 and PMTS
AC POWER TRANSFER SWITCH PMTS-30 and PMTS

... 3000 rms symmetrical Amps. 240 V AC Max operating voltage The PMTS-50 is rated for use on a circuit capable of momentarily delivering not more than: 5000 rms symmetrical Amps. 240 V AC Max operating voltage When L1 and L2 (rated for 35 A each) are connected in phase, generator-neutral capability wil ...
< 1 ... 511 512 513 514 515 516 517 518 519 ... 576 >

Power over Ethernet



Power over Ethernet or PoE describes any of several standardized or ad-hoc systems which pass electrical power along with data on Ethernet cabling. This allows a single cable to provide both data connection and electrical power to devices such as wireless access points or IP cameras. Unlike standards such as Universal Serial Bus which also power devices over the data cables, PoE allows long cable lengths. Power may be carried on the same conductors as the data, or it may be carried on dedicated conductors in the same cable.There are several common techniques for transmitting power over Ethernet cabling. Two of them have been standardized by IEEE 802.3. Since only two of the four pairs are needed for 10BASE-T or 100BASE-TX, power may be transmitted on the unused conductors of a cable. In the IEEE standards, this is referred to as Alternative B. Power may also be transmitted on the data conductors by applying a common-mode voltage to each pair. Because twisted-pair Ethernet uses differential signalling, this does not interfere with data transmission. The common mode voltage is easily extracted using the center tap of the standard Ethernet pulse transformer. This is similar to the phantom power technique commonly used for powering audio microphones. In the IEEE standards, this is referred to as Alternative A.In addition to standardizing existing practice for spare-pair and common-mode data pair power transmission, the IEEE PoE standards provide for signalling between the power sourcing equipment (PSE) and powered device (PD). This signaling allows the presence of a conformant device to be detected by the power source, and allows the device and source to negotiate the amount of power required or available. Up to a 25.5 watts is available for a device.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report