Carbon Cycle Chemical Reactions Involved: Photosynthesis: Air and water molecules and the energy from the sun to produce a simple sugar such as glucose and oxygen molecules as a by product. During photosynthesis plants use carbon dioxide and produce oxygen.
Similar to shore power for ships, a ground power unit (GPU) may be used to supply electric power for an aircraft on the ground, to sustain interior lighting, ventilation and other requirements before starting of the main engines or the aircraft auxiliary power unit (APU).
Power Supply: The primary purpose of a power supply in a power amplifier is to take the 120 VAC power from the outlet and convert it to a DC voltage (VAC is an abbreviation for Volts Alternating Current, and DC is an abbreviation for Direct Current).