'affect' is correct and usable in written English. It is most commonly used as a verb meaning to influence or cause change in something. Example sentence: His words had an immediate affect on her mood.
"Although the investigation is in its early stages, we will take action to protect the public if we uncover evidence that could affect the safety of other rides at the park or elsewhere".
"It is not going to affect the set-up for the game in any way, shape or form.
A Department for Transport spokesman said: "It is extremely disappointing that Network Rail's engineering works have overrun and will affect travellers during this festive season, passengers will be rightly annoyed.
Further Scottish devolution and measures that will give English MPs more say over laws that only affect England.
Though all of us are all sensitive to heat, and quick to react when it climbs above our comfort levels, our knowledge of how it might affect our health doesn't really go beyond sunstrokes and fainting spells.
Writing before the announcement that Australia was withdrawing its ambassador, he predicted the executions would affect Australians' perceptions of Widodo for the rest of his tenure, but warned against such a step.
When interviewed, aspiring journalists with disabilities said the issues that concerned them most were: whether or not to disclose their disability in a covering letter with their CV; if they had the right image for the employer; and whether or not the disability would affect their ability, or perceived ability, to perform a task.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia