| Electric current that flows in one direction, from positive to negative then reverses direction, from negative to positive. | |
| The lower Engine part with main rod bearing journals. It converts reciprocating motion to rotary motion. | |
| The volume displaced by all of the pistons in all of an engine's cylinders. | |
| An electrical device that receives information from sensors and makes decisions based on these inputs along with programmed information, and send out the decisions to actuators. |