In your case, answer is NO, you do not need resistor. No need for a resistor. The general rules for these kinds of things are: Don't exceed the rated voltage (in your case 12 V DC - or 15 V DC, it is not entirely clear to me). Use a power supply that can provide at least the rated current (in your case 85 mA).
If fitted to the Chassis, a bad earth connection is possible and can result in problems with the lighting system of the vehicle. Further, LED Load resistors must be mounted on a metal surface, the resistor can reach temperatures of up to 170 Celsius. The most common functions requiring Load Resistors are generally the indicator and brake circuits.
\n \n \ndo i need a resistor for led
Hook up a 10K resistor and a 9-volt battery (or 9 volts DC from a power supply) to one of your LED's, and measure the voltage across the LED. (You can use any 10K resistor you can find). V=IR, so I=V/R which is 9 / 10K which is 0.9 mA or about one thousandth of an Amp. If we do it more properly (include the forward voltage of the LED in the Mar 31, 2009. #3. depends on what you want the resistor to do. for example: you have two leds and connect the resistor to voltage and the other side to both leds. no problem here, but if you connect both leds to voltage and both cathodes (negative side) to the resistor then it won't work as nicely. One of the leds may be dimmer or not on at all
For example, the white LED has a forward voltage range of 2.8-3.4V and a forward current of 350 mA. Dividing the 24V by the forward voltage, I can have 8 white LEDs in series. Now the question is do I still need the resistor added in the series or is the number of LEDs enough to limit the current to around the 350 mA range?
Step 1: 3 Volt Basic LED Circuit With 10 Ohms Resistor. The above diagram shows a 3V LED circuit, in this circuit there are two AA cells are used. When you are operating an LED with 3V you have to use minimum 10 ohms resistor . For more details visit Simple Basic LED Circuit. Ask Question. This calculator is based on the Ohms Law Calculator, but takes into consideration the voltage drop from the LED. To use the calculator, enter any three known values and press "Calculate" to solve for the others. Click "Calculate" to update the fields with orange borders. Calculate resistor values for LEDs using this simple calculator.
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    • do i need a resistor for led