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).
It senses voltage on the coach and. chassis batteries. If the voltage on either one is above. 13.1 volts, indicating the battery is being charged, it closes. the isolator relay, paralleling the batteries, charging both. It operates in two directions, charging the batteries from. the engine alternator and charging the batteries from the. converter.