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).
For buses with. eight to ten terminals, use two SEL-487B relays. For buses with as many as 21 terminals, use three SEL-487B. relays; each relay provides as many as six independent and adaptable zones of protection. Contact SEL.