Why is a resistor needed for an LED?

Related questions

1. Is the anode oxidized or reduced?
2. Do LED light strips use a lot of electricity?
3. Is lead or led correct?
4. How does RGB LED work?
5. Should I wire LEDs in series or parallel?
6. How do you connect LED lights?
7. Do LED light strips get hot?
8. How does LED lighting work?
9. What are LEDs used for?
10. Can you leave LED strip lights on all night?

Tags

1. #circuits
2. #emitting
3. #ballast
4. #emits
5. #source
6. #light
7. #diode
8. #limit
9. #resistor
10. #through
11. #prevent
12. #electric
13. #voltage
14. #passes
15. #current
16. #resistors
17. #equal
18. #burns
19. #required