The difference

affect / effect

to affect a person or thing意为影响某人或某事。

Fitness affects you mentally and physically, and how you feel affects everything from your relationships to your ability to cope.

健康影响精神和身体，而你的感受影响一切，包括人际关系和处理解决问题的能力。

One of the problems with noise is that it affects different people in different ways.

噪音的问题之一是它对不同的人产生不同的影响。

Emotional states can affect our hormone levels.

情绪会影响激素水平。

affect的名词是effect。something affects you与it has an effect on you同义，其意为某事会对某人产生影响。

...the effect of noise on people in factories.

……噪音对工人的影响。

...under the effect of the anaesthetic.

……在麻醉药的作用下。

to effect something like a change or a repair 意为导致变化或修复等。effect用作动词相当正规，还不如把effect用作名词常见。

She claimed that all her cures were effected solely by known medicines and by prayers.

她声称她所有的疾病完全靠现有药物和祈祷就可以得到治愈。

Mrs Moffat had effected hasty repairs with tape and gummed paper.

莫法特太太匆匆用胶带和黏胶纸给予修复。

参考资料：||

effect是名词

affect是动词