Lets try another more complex resistor combination circuit. Then continue to replace any series or parallel combinations until one equivalent resistance, R EQ is found. It is sometimes easier with complex resistor combinations and resistive networks to sketch or redraw the new circuit after these changes have been made, as this helps as a visual aid to the maths. This therefore gives a total supply current, I T of: 0.5 + 0.5 = 1.0 amperes as calculated above. Since the resistive values of the two branches are the same at 12Ω, the two branch currents of I 1 and I 2 are also equal at 0.5A (or 500mA) each. We can take this one step further by using Ohms Law to find the two branch currents, I 1 and I 2 as shown. Then we can see that any complicated resistive circuit consisting of several resistors can be reduced to a simple single circuit with only one equivalent resistor by replacing all the resistors connected together in series or in parallel using the steps above. The method of calculating the circuits equivalent resistance is the same as that for any individual series or parallel circuit and hopefully we now know that resistors in series carry exactly the same current and that resistors in parallel have exactly the same voltage across them.įor example, in the following circuit calculate the total current ( I T ) taken from the 12v supply. Resistor circuits that combine series and parallel resistors networks together are generally known as Resistor Combination or mixed resistor circuits. ![]() ![]() What if we want to connect various resistors together in “BOTH” parallel and series combinations within the same circuit to produce more complex resistive networks, how do we calculate the combined or total circuit resistance, currents and voltages for these resistive combinations. But we can also connect resistors in series and parallel combinations together. ![]() Knowing how the parallel resistors arrangement work makes it possible to apply the current divider rule in the circuit.In the previous tutorials we have learnt how to connect individual resistors together to form either a Series Resistor Network or a Parallel Resistor Network and we used Ohms Law to find the various currents and voltages across each resistor combination. The calculator automatically gives you the required missing resistor after each input.Start by introducing the values of the resistors you already know (new fields will appear as needed).Now input the total resistance you want your circuit/collection of resistors to have.Select Calculate missing resistor under Mode.Let's look at an example for the second, slightly more complicated, mode: You can input up to 10 resistors in total. To keep it simple, we only show you a few rows to input numbers, but new fields will magically appear as you need them. In contrast, the second mode allows you to set the desired total resistance of the bunch and calculate the one missing resistor value, given the rest. ![]() The first mode allows you to calculate the total resistance equivalent to a group of individual resistors in parallel. The parallel resistor calculator has two different modes.
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