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Led Calculation

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Submitted By farris88
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How to calculate the value of resistor for LED’s (with different types of LED’s circuits) This tutorial will help you to find the proper value of resistor (or resistors) for one or more LED’s to connect with battery.
If you pick this topic, you will be able to:
Calculate the value of resistors for different LED’s Circuit diagrams
Calculate the Forward Current of LED’s
Calculate the Forward Voltage for different LED’s Circuits
Connect LED’s in Series with batter
Connect LED’s in Parallel with battery
Connect LED’s in Series-Parallel Circuits

Typical LED Symbol, Construction and Lead Identification. Click Image to enlarge

Before we go in detail, we will try to get ride on below simple circuit, so that the other calculation will be easier to understand. Click Image to enlarge

This is the Simplest LED Series circuit ever. Here, the supply voltage is V, LED Forward Voltage (VF) is 1.3 Volt and Forward Current (IF) is 10mA.
Now the Value of resistor (which we will connect in Series with LED) for this circuit would be:
Resistor Value = (Vsupply - VF)/ IF
= (6 -1.3) / 10mA = 470 Ω
Current draw = 20mA
Resistor Power rating formula for this circuit
Resistor Power Rating = IF2 x Resistor Value
= (10mA) 2 x 470 Ω = 0.047W = 47mW
But This is the minimum required resistor value to ensure that resistor will not overheat, so its recommended that to double the power rating of resistor that you have calculated, therefore, choose 0.047W x 2 = 0.094W = 94mW resistor for this circuit.
Resistor power rating (Value is doubled) = 0.094 W = (94 mW)
Also keep in mind that: * It is too difficult to find the exact power rating resistors that you have calculated. Generally, Resistors come in 1/4 watt, 1/2 watt, 1 watt, 2 watt, 5 watt, and so on. Therefore, select the

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