Logic gates, logic circuits and truth tables

Learning objectives

Draw and identify the symbols for the NOT, AND, OR, NAND, NOR and XOR gates, and write the truth table for each single gate

Build a logic circuit from a written description of a problem, from a logic expression or from a truth table, using up to three inputs and no more than six gates

Complete the truth table for a given logic circuit by working out the output of every gate for each combination of inputs

Write the logic expression produced by a given logic circuit, using the correct notation for NOT, AND, OR, NAND, NOR and XOR

Draw the logic circuit described by a given logic expression, and check the circuit against a truth table

Apply logic gates to a described control situation, such as a safety system that must switch on only for stated combinations of sensor readings