Electrical components in the circuit in which the state and the connection method

The relay contactor control circuit is composed of the switching circuit. In the circuit, electrical components only two states: coils or power, contact closure or disconnected. This "opposition" in two different states, you can use the logical value means, that can be used to switch algebra (logic algebra) to describe these electrical components in the circuit in which the state and the connection method.  electri cenergy meter , contactors, solenoids, solenoid valves, electromagnetic clutches and other components, the coil is energized to define their "l" status, loss of power for the "0" state; For buttons, limit switch elements  electric meter  pressed to "l "state and resume the" 0 "state; the contact element to provide a closed contact state is" l "state, the contact open state to" O "state. Element coil and its normally open contact state with the same ~ character representation such as K; while its normally closed contact state with the character of the "non" to indicate if element is "l" status, it means that its coil "power ", the relay pull its normally open contact closure, the normally closed contacts disconnect. If the element is a "O" state, and the opposite.