Whan do you use it? Can you give a couple of samples?
one-second

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I will omit the hyphen. 
Please wait for one second.
One second is one sixtieth of a minute.

1/2 is one half

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examples

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You might use it if someone asks you to do something and you cannot respond straight away. If i was writing something and someone asked me a question i might say "one second"  as a way to get them to wait whilst i finished what i was doing. Some would say "one minute". Its really shorthand for "wait a second, or wait a minute".

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When do you use it.  Please would you give a couple of samples?