verb
1
BAD : The programme is about computers and their affects on our lives.
GOOD : The programme is about computers and their effect on our lives.
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To affect something (verb) is to have an effect on it (noun): 'Smoking affects your health.' (= smoking has an effect on your health)
2
BAD : This problem has also affected on the automobile industry.
GOOD : This problem has also affected the automobile industry.
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affect sb/sth (WITHOUT on ): 'Fortunately these new tax laws don't affect us.'
Compare: 'This problem has also had an effect on the automobile industry.'