KwickClips Computer Systems · 45 sec · free
Which gate gives the sum?
Short answer. XOR.
Which gate gives the carry?
AND.
Half adder
| A B | Sum | Carry |
|---|---|---|
| 0 0 | 0 | 0 |
| 0 1 | 1 | 0 |
| 1 0 | 1 | 0 |
| 1 1 | 0 | 1 |
Remember
| Sum = A XOR B |
| Carry = A AND B |
In binary, one plus one is one zero. How do gates do it? Use a half adder. Zero zero gives nothing. Zero one gives sum one. One zero gives sum one. One one gives sum zero, carry one. Two gates. Sum is XOR. Carry is AND.
This clip is from the full lesson: Adders and Combinational Circuits: Half Adder and Full Adder — 8 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: ISC Class 11 Computer Science (868), ISC Class 12 Computer Science (868), ISC Class 12 Computer Science (868), Programming All levels C
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