|Resistor Value||XXXX Ω|
|Wattage Recommendation||XXXX W|
Number of LEDs:
LEDs are a part of every celebration in our lives. We use them for decoration of our little toy house to huge stage decorations. As we move ahead in this LED resistance calculator post, we will learn many aspects related to LEDs and the calculations associated with them.
Electrons are the basic particles that are behind the energy emission in the form of light. Based on their conductivity, materials are classified into three major categories:
The advantage with semi-conductors is we can regulate the amount of their electricity flow by controlling their doping concentrations and their working temperature.
One of such devices that work on the principle of semi-conductors is Diode. A main advantage of diodes is that they conduct only in one direction and do not conduct in the other.
Diodes contain free electrons and holes. When energized through a source of electrical energy, electrons fall into holes, and they lose their energy in the form of packets called photons, which is nothing but the light that we see. The wavelength of the light thus emitted depends on the energy lost by the electrons, which is determined by the type of the semiconductor material.
Thus, in an LED, electrical energy is converted into light energy.
This phenomenon by which an LED emits light under the influence of external electrical energy is known as electroluminescence.
As mentioned, the energy lost by an electron depends on the type of semiconductor used. For example:
Besides, there exists a relation between the color of the light emitted and the type of semiconductor too:
LEDs are also made up of other semiconductor materials such as zinc selenide, gallium nitride, silicon carbide, gallium arsenide.
LED resistors are required for limiting current generated within a LED. This is necessary as:
The relation between the input voltage and current generated in a diode is exponential. Any change in the input voltage can result in a large amount of current being generated in the LED. This can often damage the LED itself. Hence, a resistor is added prior to the LED in a circuit.
A resistor is chosen because:
For a resistor, the relation between the input voltage and the generated current is always linear, as per ohm’s law. Hence, connecting a resistor before a LED ensures that a safe amount of current is allowed to be input into the LED.
Note: On their own, LEDs do not have resistance. Hence when you connect a resistance and LED in a circuit, the overall resistance is the value of the resistors that are present in the circuit.
The value of the resistor that has to be connected across a LED depends on the following factors:
The number (n) of LEDs connected in series or parallel in the entire circuit. Thus:
The value of LED resistor R = ( Vs – Vf ) / If , when there is a single LED in the circuit.
In case LEDs are connected in series, then the value of LED resistor is R = ( Vs – (Vf x n ) ) / If
In case LEDs are connected in parallel, then the value of the LED resistor is R= ( Vs – Vf ) / ( If x n )
Based on their electrical properties, broadly three types of LEDs are identified:
However, care should be taken that they are not subjected to excess input voltage or current. Else, they get damaged very easily.
Since their invention, LEDs have grown in their efficiency and output drastically due to the advancement in technology. Besides being used in decoration lamps and traffic signals, LEDs today are practically being used in many applications:
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LED resistance calculator is one of the 100+ free online calculators of CalculatorHut. It is specifically designed to make LED resistance calculation simpler for you. All that you need to do is pick the color of LED that you wish, give the values of other parameters in the spaces provided. You can instantly find the value of the resistor that you need to choose for the respective circuit design.
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