Combinational circuit
- The
output at any time depends only upon present input at that time.
 
-  The previous
input condition does not affect the output. 
 
- No memory
 
Sequential circuit
- The
output at any time depends only upon present input at that time as well as past
input. 
 
- It consists of memory. 
 
- It is made of combinational circuit and memory
elements.
 
Compare Power transformer and Distribution transformer
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