Commutator (electric) A commutator is a moving part of a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. It consists of a cylinder composed of multiple metal contact segments on the rotating armature of the machine.
The word equation that would represent the formation of lithium oxide from lithium metal and oxygen is: lithium + oxygen to lithium oxide. In chemical symbols, the balanced chemical equation is expressed as: Li + O2 = Li2O.
Lithium hydride is the inorganic compound with the formula Li H. It is a colorless solid, although commercial samples are grey. Li + H 2 â 2 LiH. This reaction is especially rapid at temperatures above 600 Â°C. Addition of 0.001â0.003% carbon, or/and increasing temperature or/and pressure, increases the yield up to 98% at 2-hour residence time.