19 parallel LED beads in series, how much resistance can be connected to 12V battery? Ordinary size of LED beads, a total of 19, are parallel. Need to series how much resistance can be directly connected to the 12V battery?

19 parallel LED beads in series, how much resistance can be connected to 12V battery? Ordinary size of LED beads, a total of 19, are parallel. Need to series how much resistance can be directly connected to the 12V battery?

LED lamp rated voltage U1 is how much, rated current I1 is how much
In addition, 19 parallels can be considered as a whole, calculate a resistance R1 (through U1 / I1), and then assume that a resistance R2 needs to be added, then (R1 + R2) * 19 * I1 = 12V. In this way, R2 can be calculated

How much resistance does 3.7V LED bulb need with 12V power supply?

It is not recommended that you use the method of adding resistance, so the power consumption will be faster, and the effect of energy saving can not be achieved. You can buy a 12V input LED power supply to convert it

How much resistance does a group of blue LED lights (15 pieces) 12V power supply need? How many resistors do they need? In series? Positive -- R -- led -- R -- led -- negative
A group of LED lights blue (15) 12V power supply need how much resistance? How many resistance? This series? Positive -- R -- led -- R -- led -- negative like this? Do not understand, don't mess with, sit and wait!
In series, we can directly say how much resistance to use

The working voltage of blue lamp is generally 3.3.3v, so only three LEDs and one resistor can be connected in series as a group. If four LEDs are connected in series, no resistor is needed. However, it's better to limit the current with a resistor in series, and calculate according to the current of 15 ~ 20mA (see the parameters of your own LED). The resistor value is 150 ~ 200 Ω, and the resistance power is 1 / 8W
For example, if the working voltage of LED is 3V and the current is 15mA, then according to three LEDs and one resistor, (12-3 × 3) V / 15mA = 200 Ω, the resistor power is 0.015A × 3V = 0.045w. According to this formula, you can calculate it according to the actual led parameters. The resistor power generally retains 50% margin, that is to say, according to 0.045w, it is generally above 0.09w

How big is the current of 4 square lines? How to calculate?

4 square aluminum wire is about 25A, copper wire should be larger, which is equivalent to 6 square aluminum wire. About 30a, the current carrying capacity of the wire is generally in accordance with the principle of 10 times 5 hundred times 2, and also according to the length of the wire, the longer the current carrying capacity is, the smaller the current carrying capacity is