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  2. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  3. 80 Plus - Wikipedia

    en.wikipedia.org/wiki/80_Plus

    For a given power supply, efficiency varies depending on how much power is being delivered. Supplies are typically most efficient at between half and three-quarters load, much less efficient at low load, and somewhat less efficient at maximum load. Older ATX power supplies were typically 60% to 75% efficient. To qualify for 80 Plus, a power ...

  4. Power optimizer - Wikipedia

    en.wikipedia.org/wiki/Power_optimizer

    A power optimizer is a DC to DC converter technology developed to maximize the energy harvest from solar photovoltaic or wind turbine systems. They do this by individually tuning the performance of the panel or wind turbine through maximum power point tracking, and optionally tuning the output to match the performance of the string inverter (DC to AC inverter).

  5. Electrical efficiency - Wikipedia

    en.wikipedia.org/wiki/Electrical_efficiency

    As a result of the maximum power theorem, devices transfer maximum power to a load when running at 50% electrical efficiency. This occurs when the load resistance (of the device in question) is equal to the internal Thevenin equivalent resistance of the power source. This is valid only for non-reactive source and load impedances.

  6. Superconducting magnetic energy storage - Wikipedia

    en.wikipedia.org/wiki/Superconducting_magnetic...

    When the load does not meet the generated power output, due to a load perturbation, this can cause the load to be larger than the rated power output of the generators. This for example can happen when wind generators don't spin due to a sudden lack of wind. This load perturbation can cause a load-frequency control problem.

  7. Buck converter - Wikipedia

    en.wikipedia.org/wiki/Buck_converter

    The input is left side, the output with load is right side. The switch is typically a MOSFET, IGBT, or BJT transistor. A buck converter or step-down converter is a DC-to-DC converter which decreases voltage, while increasing current, from its input to its output . It is a class of switched-mode power supply.

  8. Sharp downgrades to US unit labor costs bode well for ...

    www.aol.com/news/us-third-quarter-unit-labor...

    Unit labor costs - the price of labor per single unit of output - increased at a 0.8% annualized rate last quarter, the Labor Department's Bureau of Labor Statistics said.

  9. Maximum power transfer theorem - Wikipedia

    en.wikipedia.org/wiki/Maximum_power_transfer_theorem

    The red curve shows the power in the load, normalized relative to its maximum possible. The dark blue curve shows the efficiency η. The efficiency η is the ratio of the power dissipated by the load resistance R L to the total power dissipated by the circuit (which includes the voltage source's resistance of R S as well as R L):