You need to calculate a new value for the 10k ohm resistor depending on the new LED. But I suspect that the value 10k isn't changing that much since LED have from 1,x to 3,x V forward voltage. And to have a 10k in series with a LED indicates that you have 220V as Vcc.
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
For typical green LEDs, that's usually about 2.1 V. Red LEDs are lower, and IR LEDs even lower still. Blue and white are higher, like a bit over 3 V. Let's say for sake of example you have a typical 20 mA green LED that drops 2.1 V. The battery puts out 9 V, so that leaves 9V - 2.1V = 6.9V accross the resistor in series with the LED.
First and formost we have to consider the series connection parameter, and check how many LEDs can be accomodated within the give supply voltage. We do this by dividing the supply voltage by 3 volts. The answer will be obviously = 4. This gives us the number of LED that could be accommodated within the 12V supply. The LED load resistor creates a voltage drop so the LED turn signals blink at a proper speed. If the LED load resistor was not installed, the LED turn signal would blink too rapidly, and would eventually be destroyed by the high voltage. Need to upgrade? Check out this post to learn how to make the switch to LEDs. Common Resistor Applications Placing a resistor in parallel is generally a bad idea. It is like making your car go slower by breaking while not releasing the gas/accelerator. To make the LED last long: Use a RED LED as there require the lowest voltage meaning the LED will still light up as the battery depletes. Use a LED with a high efficiency. Voltage Drop of LED. But that is probably incorrect, because the voltage drop of the LED is approx 2V, right? I probably need to calculate 1V / 0.15 and use a 60 Ohm resistor (or something close). Would the buzzer work since it requires min of 3V and the LED drops the voltage by 2V? FBu2tW.
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    • do i need a resistor for led