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).
The SEL-487B Relay provides bus current differential protection, circuit breaker failure protection, and. backup overcurrent protection. The relay has 21 analog current inputs and three analog voltage inputs. For. buses with no more than seven terminals, use one SEL-487B in a single-relay application.