affect on/effect on

[mylevt]

Hi,
How can I differentiate between "affect on" and "effect on"?
1. Lack of sleep can have a noticeable affect on your performance at work.
2. Lack of sleep can have a noticeable effect on your performance at work.
Thanks.

[rogusx]

'Affect' as a noun is rarely used (and crops up mainly in psychology as it relates to emotions). The correct word to use when you mean something has direct consequences for something else, is 'effect'.

[Fizi]

Hi, How can I differentiate between "affect on" and "effect on"?
1. Lack of sleep can have a noticeable affect on your performance at work.
2. Lack of sleep can have a noticeable effect on your performance at work.
Thanks.

I'd use 2 because effect is usually used as a noun, while affect is usually used as a verb. Compare a sentence where affect/effect is acting as a verb: "Lack of sleep can affect your performance at work.

[mylevt]

Thank you for your explanation.

[Archie]

this is worth visiting

http://www.wsu.edu/~brians/errors/affect.html