Binary Logic

 A binary digit, or bit, can have one of two states. That is what DW described.
Binary logic is usually used to refer to computer gates that create a result based on binary input.

 0 = (not 0) 1

1 = (not 1) 0

Not gates don't need a signal (0) to output a signal. 

 

 And gates need both inputs to be on (1) to output a signal. 

0 AND 0 = 0
0 AND 1 = 0
1 AND 0 = 0
1 AND 1 = 1

or gates need atleast one input to be on (1) to output a signal.

 0 OR 0 = 0
0 OR 1 = 1
1 OR 0 = 1
1 OR 1 = 1

 

 

on switch- 1

off switch- 0