When it comes to turn signal bulbs, LED models need a resistor (or flash controller) in order to function properly and at their maximum efficiency. One LED resistor is needed for each turn signal bulb. Many LED turn signal bulb models feature built-in resistors to make the upgrade a seamless one. Stock incandescent bulbs drain more energy from
Each of the lines above represent a different voltage bin. To achieve 60 mA for all of the LED bins, different resistor specifications must be used to achieve different forward voltages needed to achieve the same 60 mA. 2) Current limiting resistors protect against voltage increases. We saw above the LEDs have a nonlinear relationship between
A Better Answer. A resistor is not needed to drive an LED. What is needed is a means to limit the current that flows through the LED. Resistors offer an expedient means for limiting the current through an LED to safe levels, but they have two downsides: 1. Resistors are inefficient:
You need to know the maximum current that the LEDs are intended to run at. Call this Imax amps. Let the battery voltage be Vbat, and the combined voltage of all the LEDs be Vled. The resistor you need is given by. R = (Vbat - Vled) / Imax For a safety margin, round the resistor up to the next commonly available value.
The main reason LEDs need resistors is to protect the LED from excessive current which can permanently damage the LED. LEDs have current ratings which indicate the optimal current at which the LED operates effectively. Resistors are devices that have the function of limiting current within the current range of the LED making them the perfect
Often, a red LED's forward voltage is ~2V, a green one ~3V, and a blue one is ~3.4V, but it really does depend on the LED manufacturer and the exact frequency of the light emitted. Once you know the forward voltage of an LED, you can use Ohm's Law to calculate the resistor you need for a given power supply voltage.
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do i need a resistor for led
