LED s      

 
 

                                      

Questions

1) LEDs are in common use as Christmas and Diwali lights. How many LEDs must be connected in series to be safely connected into a 120 VOLT circuit without a limiting resistor.

2) a) What what is the voltage across the limiting resistor in the circuit belows? 

b) If we want to limit the current to 80mA then what size of resistor is used?
 80mA = 0.080A

                                             3)