Why isn't my iPhone charging when plugged in?

Related questions

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4. Why isnt my laptop charging when plugged in?
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6. Why does my iPhone say this accessory is not supported when charging?
7. Why wont my iPhone charge even though it says it is?
8. What does this accessory may not be supported mean?
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Tags

1. #working
2. #light
3. #itself
4. #switch
5. #charge
6. #turned
7. #where
8. #common
9. #change
10. #outlet
11. #reason
12. #sometimes
13. #actually
14. #plugged
15. #using
16. #iphone
17. #charger
18. #because