KwickClips Computer Systems · 44 sec · free
When does an AND gate give 1?
Short answer. Only when all inputs are 1.
When does an OR gate give 1?
When at least one input is 1.
Gates as switches
| Gate | Switches | Bulb on when |
|---|---|---|
| AND | in series | both on |
| OR | in parallel | any one on |
| NOT | one button | switch off |
Remember
| AND: all inputs 1 |
| OR: at least one 1 |
| NOT: the opposite |
Two switches, one bulb. When does it glow? Gates work like switches. AND is series, so both must be on. OR is parallel, so any one is enough. NOT flips the input. Three rules. AND needs all ones. OR needs one. NOT flips.
This clip is from the full lesson: Logic Gates and Truth Tables — 9 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 11 Computer Science (083), CBSE Class 11 Computer Science Essentials (083), ISC Class 11 Computer Science (868), ISC Class 11 Computer Science (868)
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