1. 
   Power Management Unit
   The Power Management Unit (PMU) is a microcontroller that governs power functions of digital platforms. This microchip has many similar components to the average computer, including firmware and software, memory, a CPU, input/output functions, timers to measure intervals of time, as well as analog ...
   Found op http://en.wikipedia.org/wiki/Power_Management_Unit
   
   
2. 
   Power processing unit
   In the context of spacecraft, the power processing unit (PPU) is a module containing the electrical subsystem responsible for providing electrical power to other parts of the spacecraft. The PPU needs to be able to cope with varying demands for power output and provide that power in the most effici...
   Found op http://en.wikipedia.org/wiki/Power_processing_unit
   
   
3. 
   Power supply unit
   [computer] A power supply unit (PSU) converts mains AC to low-voltage regulated DC power for the internal components of the computer. Modern personal computers universally use a switched-mode power supply. Some power supplies have a manual selector for input voltage, while others automatical...
   Found op http://en.wikipedia.org/wiki/Power_supply_unit_(computer)
   
   
4. 
   power supply unit
   (hardware) (PSU) An electronic module that converts high voltage (110 or 240 VAC) alternating current mains electricity into smoothed direct current at the various differnt voltages required by the motherboard; internal peripheral devices, cheifly storage devices: hard disks, CD or DVD, floppy disks...
   Found op http://foldoc.org/power+supply+unit
   
   
5. 
   Power transfer unit
   In aviation, a Power Transfer Unit (PTU) is a device that transfers hydraulic power from one of an aircraft`s hydraulic systems to another in the event that second system has failed or been turned off. Modern airliners have separate, independent hydraulic systems powered by engine-driven pumps. The...
   Found op http://en.wikipedia.org/wiki/Power_transfer_unit
   
   
6. 
   power unit
   [n] - a measure of electric power
   Found op http://www.webdictionary.co.uk/definition.php?query=power%20unit
   
   
7. 
   power unit
   noun a measure of electric power
   Found op http://wordnetweb.princeton.edu/perl/webwn?s=power%20unit
   
   
8. 
   Power Unit
   The device on hydraulic elevators which supplies the motive force to run the car.
   Found op http://www.thyssenkruppelevator.com/glossary.html
   
   

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