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2. Frequency changer - Wikipedia

   en.wikipedia.org/wiki/Frequency_changer

   A variable-frequency drive (VFD) is a type of frequency changer used for speed control of AC motors such as used for pumps and fans. The speed of a synchronous or induction AC motor is dependent on the frequency of the AC power supply, so changing frequency allows the motor speed to be changed. This allows fan or pump output to be varied to ...

3. Booster (electric power) - Wikipedia

   en.wikipedia.org/wiki/Booster_(electric_power)

   In the days of direct current mains, voltage drop along the line was a problem so line boosters were used to correct it. Suppose that the mains voltage was 110 V. Houses near the power station would receive 110 volts but those remote from the power station might receive only 100 V so a line booster would be inserted at an appropriate point to "boost" the voltage.

4. Booster pump - Wikipedia

   en.wikipedia.org/wiki/Booster_pump

   The engine needs a fuel tank and an automatic controller that will start the booster pump when it is needed. A small auxiliary electrically-powered booster pump (called a "jockey pump") is often included in the system to maintain the sprinkler pipes at sufficient pressure, without requiring startup of the large diesel engine.

5. Inverter compressor - Wikipedia

   en.wikipedia.org/wiki/Inverter_compressor

   Before, fixed-speed on/off compressors required an inrush, or surge, current that was 4 to 6 times greater than the running current at startup, meaning a requirement of 4 to 6 times more solar panels or batteries. Inverter compressors start slowly and avoid this startup power which is needed each time a standard on/off compressor comes on.

6. AC motor - Wikipedia

   en.wikipedia.org/wiki/AC_motor

   An AC motor is an electric motor driven by an alternating current (AC). The AC motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field , and an inside rotor attached to the output shaft producing a second rotating magnetic field.

7. Elwood Edwards, the voice behind AOL's 'You've Got Mail ...

   www.aol.com/news/elwood-edwards-voice-behind...

   Elwood Edwards, who lent his voice to AOL's "You've Got Mail," passed away Tuesday at the age of 74, according to his former employer WKYC.