When do I use 'effect' vs. 'affect' (beside the part where one is a verb and the other's a noun)

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affect can mean to influence people in a physical or psychological way, as in "The painting affected him so deeply he could not speak," or "The dam breaking affected the water level downstream." It can also mean to pretend to feel or think something, such as "She affected an interest in art," or "He affected to understand what she was saying, even though he was actually confused."

The word effect refers to the result of something, the power something might have to get a specific result, or a natural phenomenon. For example, "The effect of the election was a new balance of power" suggests a direct result, while "The effect of the painting on him was to inspire his own work" focuses on the power needed to make something happen. Phenomena are often also referred to as effects, such as "the photoelectric effect" or "the greenhouse effect

Hi, I didn't even know the difference myself, I just got this off a website. I hope it helped.