Boolean circuits are logic circuits consisting of various "gates" that are arranged to combine two or more bits into a single-bit output. Using the term "false" to represent an input/output that is "off" or a "0"; "true" to represent an input/output that is "on" or a "1"; and A, B, C, etc. as inputs and X as the ouput... AND gate: has two or more inputs that will result in a true output only if all of the inputs are true. If A AND B AND C are true, then X is true. OR gate: has two or more inputs that will result in a true output if any one of the inputs is true. If A OR B OR C is true, then X is true. XOR (eXclusive OR) gate: has two inputs that will result in a true output if and only if one of the two inputs is true. If A AND B are both true or both false, then X is false.
If A is true OR B is true, then X is true. NOT gate: inverts the value of a single input. If A is true, then X is false. If A is false, then X is true. Gates called NAND (NOT-AND) and NOR (NOT-OR) have a built-in NOT function for the output. You can build a very simple AND or OR gate using two switches and a bulb. If the switches are wired in series so that both must be on for the bulb to light, that is an AND gate. If the switches are wired in parallel so that either one will light the bulb, that is an OR gate. XOR is somewhat more complex, but can be simulated with two-position switches. NOT would require a relay that lights the bulb when there is no power to its coil. Some info on Boolean logic and circuits: http://en.wikipedia.org/wiki/Boolean_circuits
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you need an electrical supply and a load. nice and simple.
Protection. They shut off the power to protect the equipment circuits, the main circuits and people.
This project will require a parallel circuit, not a series circuit.
The term is "circuit" (from the same root as circle) An electric circuit must be uninterrupted for the current to flow. (This is why circuit-breakers are also called circuit-interruptors.)
An electrical network is an interconnection of electrical components (e.g. batteries, resistors, inductors, capacitors, switches) or a model of such an interconnection, consisting of electrical elements (e.g. voltage sources, current sources, resistances, inductances, capacitances). An electrical circuit is a network consisting of a closed loop, giving a return path for the current.An electric circuit is a path in which electrons from a voltage or current source flow. Electric current flows in a closed path called an electric circuit. The point where those electrons enter an electrical circuit is called the "source" of electrons. The point where the electrons leave an electrical circuit is called the "return" or "earth ground". The exit point is called the "return" because electrons always end up at the source when they complete the path of an electrical circuit. The part of an electrical circuit that is between the electrons' starting point and the point where they return to the source is called an electrical circuit's "load". The load of an electrical circuit may be as simple as those that power electrical appliances like refrigerators, televisions, or lamps or more complicated, such as the load on the output of a hydroelectric power generating station.