FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -When LED is connected to a power supply with a voltage higher than its forward voltage, a current limiting resistor is connected in series with the LED. The current limiting resistor limits the current for the LED and regulates the difference in voltage drops between the LED and the power supply.

Detailed explanation-2: -Efficiency droop: The efficiency of LEDs decreases as the electric current increases. Heating also increases with higher currents which compromises the lifetime of the LED. These effects put practical limits on the current through an LED in high power applications.

Detailed explanation-3: -Typically, LEDs are characterized by forward voltage and forward current. LED current limiting resistors help maintain current at a specified level through an LED that is within the forward current values given in the LED datasheet.

Detailed explanation-4: -Resistors in Light Emitting Diode (LED) Circuits Such a resistor is often called a ballast resistor. The ballast resistor is used to limit the current through the LED and to prevent excess current that can burn out the LED.