Why do LEDs need a resistor?

Related questions

1. What is the function of lm317?
2. Do Resistors reduce current?
3. Do diodes reduce current?
4. Can resistors reduce voltage?
5. Why does E stand for voltage?
6. How do you reduce voltage?
7. What is Ohm's law formula?
8. How does an adjustable voltage regulator work?
9. How does zener diode work as a voltage regulator?
10. What happens if you don't use a resistor with an LED?

Tags

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