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).
Batteries are widely used as a source of direct current electrical energy in automobiles, boats, aircraft, portable electric and electronic equipment, and lightning. A car battery is used mainly to start the motor. Once the motor is running, an alternator supplies current to recharge the battery.