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.
Magnesium oxide (MgO) is a compound which is formed when oxygen (a gas & non-metal) from the air reacts with magnesium (a metal) to form a white powder known as magnesium oxidâ¦e, a non-metal. Usually, heat is what makes the two elements (magnesium and oxygen) react. In food, magnesium oxide is used to prevent caking.