Fundamental Hardware Elements of Computers: Boolean gate combinations

Now you have learnt logic gates we will take a look at how they are combined inside hardware. You may well be asked in an exam to draw your own logic gates or to work out what a combination of logic gates will output. In this section we will look at the best way to describe what a set of logic gates is in boolean algebra. Let's take a look at a quick example:

Exercise: Logic gate combination outputs For the following logic gate combinations work out output Q for each: Answer: Answer: Answer: This equation can be simplified to equal $A.B$, as $B.B=B$, we'll find out why this is the case in the simplifying boolean equations section coming up Answer: This equation can be simplified to equal 0 (always false), as ${\overline {A+B}}.A=0$, we'll find out why this is the case in the simplifying boolean equations section coming up Answer: