Why Do You Need A Resistor Before An Led at lindanmitchello blog

Why Do You Need A Resistor Before An Led. Once you pass the forward voltage, a slight increase in voltage makes a huge. why do we need a resistor for an led?

☑ Current In A Resistor
from amicalegc-0607.blogspot.com

why do we need a resistor for an led?the ballast resistor is used to limit the current through the led and to prevent excess current that can burn out the led. to drop 6v at 20 ma the resistor needed is r = v/i = 6 / 0.02 = 300 ohms.

☑ Current In A Resistor

Why Do You Need A Resistor Before An Led The current that flows out of a battery is always equal to the current that flows back into the battery.the answer is to place a resistor in series with the led, and allow the resistor to drop down the voltage to the led by 0.3 v.the ballast resistor is used to limit the current through the led and to prevent excess current that can burn out the led. to drop 6v at 20 ma the resistor needed is r = v/i = 6 / 0.02 = 300 ohms.