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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Which circuit is the opposite of an encoder?43 secDisclaimer. KwickAcademy is free study material for general learning and revision. Parts of it, including the voice-over, are produced with the help of AI tools and may contain errors; if you spot one, please tell us and we will correct it. Syllabus, marks and exam details follow the latest official board publications available to us, and boards can change them at any time, so always confirm against your board's official website and your school. Using this material does not guarantee any marks or result. Board names and trademarks belong to their owners; Kwickprep is not affiliated with or endorsed by any examination board. We never ask for passwords, OTPs or ID numbers. Your progress is saved only in this browser. Full disclaimer · Privacy