The current is supposed to enter through the positive side. But the resistor doesn’t care whether the connected leg is positive or negative. How true is this? Does it apply to LEDs? LEDs have polarities. Should you place the resistor on the positive or negative side of the LED? Despite what some people say, you don’t have to guess. This guide will give you a definitive answer.
Resistor On Positive Or Negative Side Of Led
LEDs require a resistor because they don’t have enough internal resistance. However, the polarity doesn’t matter to the operations of the resistor. Resistors are unaware of a circuit’s polarity. Therefore, even if you connect them backward, they will work. You don’t have to connect the resistor in a particular configuration for the device to perform its role. The current will flow through the resistor regardless of the direction.
This is not true for LED. LED is a diode. Electricity will flow through the LED in one direction, which is why polarity is so important. The current cannot flow backward. Therefore, if you wire an LED backward, it won’t work.
This sounds annoying, but it is a good thing. You don’t have to worry about destroying the LED because you wired the device poorly. Some of the experts you consult regarding the possibility of connecting the resistor to the positive or negative side may reject your question altogether because LEDs don’t have positive or negative sides.
But that is not entirely true. The average technician won’t use the terms ‘Positive’ or ‘Negative’ to describe an LED’s polarity. Instead, they will say ‘Anode’ to refer to the positive side and ‘Cathode’ to refer to the negative side.
But the concept is the same. The current flows from the positive to the negative.
If you want to know where the resistor goes, you must first figure out what the resistor does. You don’t want to expose LEDs to excess power. The LEDs will die.
But how do you control the electricity passing through the devices? You need a resistor. It limits the flow of current, preventing the LED from accessing more power than it can handle.
As far as the polarity is concerned, sciencing has provided clarification.
You have to connect the positive terminal of the power source to the LED’s anode, which is the positive side. This connection is made through a resistor. The resistor’s left lead runs to the power supply’s positive terminal while the right lead connects to the LED’s left lead.
If you don’t trust your configuration because you struggle to identify the polarities, approach the LED cautiously. Supply the voltage but keep it to 1V. The LED will only emit light if you connect the anode to the resistor.
If the LED has failed to light, raise the voltage by 0.3V. Continue to increase the voltage by these small increments. But don’t exceed 3V. If the LED is still off, you wired the device poorly. Adjust the polarity.
Does It Matter Which Side A Resistor Goes?
It doesn’t matters which side a resistor goes. Regardless of where you place the resistor, it will still perform its function. It will limit the current flowing across the lights.
Some people have seen instructions that clearly state that a resistor must connect to the anode. But those instructions are trying to discourage consumers from omitting the resistor.
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Why Resistor Is Required In LEDs?
You can’t afford to connect LEDs directly to a battery pack. They will probably overheat and fail because the voltage is too high. This is why resistors are so necessary.
As their name suggests, they introduce resistance to a circuit. If you place a resistor between a power supply and an LED, the resistor will reduce the amount of electricity flowing through the LED.
How Do You Know Which Way A Resistor Goes?
You don’t have to pay attention to the polarity when connecting resistors to an LED. But if you want to follow the instructions in your manual, and you’re determined to connect the right lead to the appropriate terminal, you may wonder how people identify the right lead to connect to the correct terminal.
LEDs have a longer lead that connects to the positive side and a shorter lead that connects to the negative side.
You can place the resistor before or after the diode. It makes no difference. The resistor will still limit the current flowing through the LED, protecting the device from unnecessary damage.
How Do You Attach A Resistor To An LED?
Attaching a resistor to an LED is not particularly difficult. Just follow these steps:
1). Get one resistor lead and solder it to the LED’s short lead. You can connect any resistor lead to the cathode. The resistor doesn’t care about polarity. But you have to maintain consistency because the polarity matters to LEDs.
2). Connect one end of a copper wire to the other resistor lead.
3). Connect the other end of the copper wire to the anode of the LED. This is the long lead.
This is all it takes. You can check the accuracy of your work by connecting the LED’s negative side to a battery’s negative terminal. The positive side connects to the battery’s positive terminal.
If you wire the resistor correctly, the LED will illuminate without burning out. If the LED burns out, you made a mistake. The resistor is supposed to protect the light from excess current.
If the LED is lighting but is too dim, the resistor is too large. But the solution is not a small resistor.
If the resistor is too small, the LED will become brighter, and it can still burn out. You need to find a balance between those two options.