An external clock is usually located on another system and can be accessed with software. You can get software to sync your internal clock to that other system. The National Institute for Science and Technology (NIST) hosts a clock that many computer users and businesses sync to.
Wow...can that answer be any more wrong?
Internal and External clocks are NOT referring to the "time of day" type clocks, they refer to the internal processor clock cycle or an external clock source. The clock cycle of a processor is the time it takes for the processor to execute a data instruction (very basic explanation there) and is measured as the speed of a processor, like a 2.6gHz processor can execute 2.6 billion clock cycles per second.
Now this is somewhat misleading as the processor speed itself is probably only 400MHz, but using an External Multiplier (clock multiplier, external clock), you increase the total amount of data the processor can execute in one clock cycle.
This is a VERY basic example and I don't have time to really go deep, so it's best to search for a more concise answer if you really require one.
internal input is the one where we give inputs as well and external input is the clock input
supported by the recorded external stimulus
The difference between a clock and a watch is a watch is worn on the wrist, and a clock is something around your home to look at to tell the time.
Both are atomic clocks but caesium atomic clock is more accurate as the internal frequency of caesium atom is more accurate and varies less than one part in 10 billion.
days
The difference between 12 hour clock and a 24 hour clock is that when you say 1:00am for a 12 hour clock you would say 0100 hours
Atomic clock is faster than mechanical clock and it is the most accurate of all clocks in the world.
the name
Internal or biological clock
register has the same clock. counter do not need to have the same clock.
"The Borrowers" features both internal and external conflicts. The internal conflict arises when Arrietty struggles with her desire to explore the outside world versus her fear of the dangers it poses. The external conflict occurs when the Clock family faces threats from the humans in whose house they live.
In science experiment paralleling this question thee subjects slept a lot during the initial stages but eventually adopted a circadian cycle of awake and asleep. It might not match the outside worlds status but what difference does it make. There is no rule that people have to set their internal clocks by your locations external clock.