affect and effect
"Affect" is usually a verb, and "effect" is usually a noun.
affect (verb):
The new deposition process affected the efficiency of the device.
effect (noun):
We measured the effect of the new process on the efficiency of the device.
These words can be confusing because "affect" can sometimes be a noun (when it denotes an emotion), and "effect" can be a verb (when it means "to bring about").
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