5 volt lamp beads with what resistance led lamp beads with what resistance

Now many friends are very concerned about what resistance is used for 5-volt lamps and what resistance is used for led lamps. So today, Chen Xing Xiaobian will share the relevant information about what resistance is used for 5-volt lamps and what resistance is used for led lamps, hoping to be helpful to everyone.

LED lamp beads are widely used in various occasions, but different volt beads require different resistors to control the current in order to achieve the best results. So, what kind of resistance should the 5-volt lamp bead exert? What resistors should LED bulbs use? This paper will give detailed answers to these questions.

5 What resistance should be added to bolt lamp beads?

A 5-volt bead usually requires a resistance of 1 ohm to control the current. This is because LED beads usually operate at 2-3 volts, while standard power supplies run at 5 volts. If the resistor does not control the current, the lamp bead will be impacted by excessive current, resulting in the lamp bead burning out. 

In practical applications, LED bulb working voltage and power supply voltage is different, the resistance of the resistance will be different. If the working voltage of the lamp bead is 3 volts and the power supply voltage is 12 volts, the resistance value of the resistor should be 39 ohms; If the operating voltage of the lamp bead is 3.2 volts and the voltage of the power supply is 12 volts, the resistance value of the resistor should be 33 ohms.

What resistors should LED bulbs use?

LED lamp bead current must be controlled in a certain range to ensure normal work and life. The function of resistance is to limit current. That is, according to Ohm's law, the current through the resistance is equal to the voltage divided by the resistance. Therefore, as long as we know the working voltage and current of LED bulb, we can calculate the resistance value of resistance according to Ohm's law.

Under normal circumstances, the voltage of LED bulb is 2-3 volts and the current is 20-30 mA heat. Take a 3-volt, 20mAh LED lamp bead as an example, and the resistance value of the resistor is as follows:

Resistance value = (power supply voltage-LED lamp working voltage) ÷ LED lamp current

Resistor resistance value = (5V-3V) ÷ 0.02 A

Resistance resistance value = 100 ohms

Therefore, a resistor of 100 ohms can be selected as the resistor to control the current of LED beads.

Why is there resistance?

The reason to add resistance to LED lamp beads, as mentioned above, is mainly to control the current and avoid excessive impact and burning of the current. In addition, the resistor can also play a role in stabilizing the current, preventing the current fluctuation from being too large and causing the lamp bead flicker or unstable brightness.

In addition, the resistor can also adjust the voltage to ensure that the voltage is stable in a certain range. This is very important for some occasions with high voltage requirements, such as circuit boards of electronic products. If the voltage fluctuation is too large, it may cause circuit failure and cause electronic products to fail to work normally.

Type and selection of resistors

When selecting resistors, factors such as resistance value, power and accuracy should be considered. Generally speaking, the greater the resistance value of the resistor, the greater the output power, the higher the precision and the more expensive the price.

In addition, resistors are divided into two types: fixed resistors and variable resistors. The resistance value of a fixed resistor is fixed and is generally used for fixed circuits; The resistance value of the variable resistor can be adjusted by adjusting the potentiometer, which is generally used for occasions where circuit adjustment is needed.

Matching of LED bulb and resistor.

The matching of LED lamp beads and resistors should be determined according to the actual situation. Under normal circumstances, the LED lamp bead working voltage and current is fixed, only according to Ohm's law to calculate the resistance of the resistance can be. However, in practical application, it is necessary to consider the factors such as power supply voltage and circuit stability to select the appropriate resistor.

If the resistance value of the resistance is too large, the brightness of the LED lamp bead will weaken and it will not work normally; If the resistance value of the resistor is too small, the LED lamp bead will burn out due to excessive current impact. Therefore, it is very important to choose the appropriate resistor .

The above is a detailed introduction of what resistance is used for 5-volt lamps and what resistance is used for led lamps. What do you think? For details, please see the relevant suggestions below. The following is a summary of this article.

LED lamp beads need resistors to control current to ensure normal operation and life. 5 volt beads generally require 1 ohm resistance; For LED lamp beads, the resistance value of resistance should be calculated according to Ohm's law, and the appropriate resistance should be selected. The type, power and accuracy of resistors should also consider the actual situation. The matching between LED lamp bead and resistor depends on the actual situation, and it is very important to choose the appropriate resistor.