6/7/2023 0 Comments Parallel resistance calculator![]() See the information below the calculator for explanation of the formula. Input value is assumed to be ohms and returns in the same input value. Please remember that RT is with no exception, always smaller than the lowest value resistor in parallel. In the formula given, RT is the total (parallel) resistance of the circuit, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, R3 is the resistance value of the third resistor, and on until the last resistor. There are other formulae for doing the resistance of only 2 resistors but this works with an unlimited number of resistors, including 2. Parallel resistance is NOT the same as averaging. After the last resistance value has been entered, click on the "Calculate Resistance" button for the returned parallel resistance value and the number of resistor values entered. There is no reasonable limitation as to the number of entries as long as you follow each entry by clicking on the "Enter Resistance" button and again on the entry box to allow for the next entry. Please be sure to click on the "Enter Resistance" button after each entry followed by clicking on the resistance entry box to prepare for the next resistor value entry. Begin by entering the resistance values into the resistance input box. There is desired a 50miliamps current per led.This calculator requires the use of Javascript enabled and capable browsers. of leds in parallel / 1000).Įxample: Let’s take the case of 4 leds connected in parallel, with a supply voltage of 120volts, at a voltage drop of 30volts. of leds in parallel / 1000).ĮRW = (Sv – Vd) * (Dc*No. Nearest highest 10% resistor = 6.8 KΩ Leds in parallel calculationĮLR = (Sv – Vd) / (Dc *No. Safe pick (resistor’s power rating) = 6.25 W ![]() Let’s try the same case at a voltage supply of 200volts: You either have to lower the amount of leds or check the given supply voltage!” Therefore we need to increase the supply. The result is: “Please note that your leds need more voltage than supply can manage. of leds in series) * (Dc / 1000).Įxample for 5 leds in series with a supply of 40volts and a drop voltage of 10volts with a desired current of 25miliamps per led. Nearest highest 10% resistor = 1.5 KΩ Leds in series calculation Safe pick (resistor’s power rating) = 0.3 W The form above is based on the following led resistor formulas depending on the calculation performed:įor your convenience the following legend will be used in the formulas:Įxample in the case of a single led, with a supply voltage of 20volts, at a drop across led of 5volts and a desired current of 12miliamps. Just choose the calculation you want to perform, press Calculate button then the tool will do the math. ![]() The led calculator can handle led resistor calculations for different types and arrays so that it requires you to input specific fields depending on what you need to estimate. This is a useful tool when working with led resistor values, either for single cases, series or parallel constructions.
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