Qualification > Sciences
physics help
Pharoah:
Digital comes from digit implying a display in the form of numeric digits like 12:15 while analogue means display using non-digital forms like non-digital stopwatches.
For a better definition check this out
http://en.wikipedia.org/wiki/Digital
For logic gate symbols:
http://en.wikipedia.org/wiki/Logic_gates#Symbols
Hope this helps.
SGVaibhav:
nice
that is also very helpfull
nice one
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