![]() ![]() 10 – Circuit Diagram of Street Lighting System and Truth Table Applications of Logic Gates The operational condition for the street light to function is as follows:īased on this, we can prepare a Truth Table as shown in Fig. Fig below shows the Circuit Diagram of Street Lighting System which mainly consists of Logic Gate (s) (NOT and OR Gate), Switch and Light Sensor. To understand the working principle of Logic Gates, let us consider the example of Street Lighting System. 9 – Symbol and Truth Table of XNOR Gate Working Principle of Logic Gates ![]() The output is ‘Low’ if either of the input is ‘Low’įig. The output of XNOR Gate is ‘High’ if both the inputs are ‘High’ or if both the inputs are ‘Low’. 8 – Symbol and Truth Table of XOR Gate XNOR Gate The output is ‘Low’ if both the inputs are ‘High’ or if both the inputs are ‘Low’.įig. The output of XOR Gate is ‘High’ if either of the input is ‘High’. 7 – Symbol and Truth Table of NOR Logic Gates XOR Gate The output is ‘Low’ if both the inputs are ‘High’ or either of the input is ‘High’įig. The output of NOR Gate is ‘High’ if both the inputs are ‘Low’. 6 – Symbol and Truth Table of NAND Logic Gates NOR Gate The output is ‘Low’ if both the inputs are ‘High’įig. ![]() The output of NAND Gate is ‘High’ if both the inputs are ‘Low’ and if either of the input is ‘Low’. 5 – Symbol and Truth Table of OR Gate NAND Gate The output is ‘Low’ if both the inputs are ‘Low’.įig. The output of OR Gate is ‘High’ if both the inputs are ‘High’ or one of the inputs is ‘High’. 4 – Symbol and Truth Table of AND Gate OR Gate (Addition) The output of AND Gate is ‘High’ if both the inputs are High and the output is ‘Low’ if both or either of the inputs is ‘Low’.įig. ![]() 3 – Symbol and Truth Table of NOT Gate AND Gate (Multiplication) The output of NOT Gate is ‘High’ if the input is ‘Low’ and Vice versa.įig. 2 – Example of Logic Gate Circuit Types of Logic Gates Any number of inputs provided results in a single output with a time delay.įig.2 below shows an example of Logic Gate circuit which has three inputs A, B, C and single output Y.įig. It displays all possible combination of the inputs and a column against each row shows the corresponding output value. If a certain condition is true, it turns “ON” and goes “OFF” when the condition is false.įunction of a Logic Gate is expressed using Truth Table. A Logic Gate accepts the input and operates on a required condition. Boolean Functions are implemented using Logic Gates. They are basically used to perform logical operations by acting as a switch. Logic Gates are the building blocks of Digital Systems. What is Logic Gates, Truth Table and its Symbols? What are Logic Gates ![]()
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