Now that you know how to handle simple series and parallel circuits, you are ready to tackle problems like this:
It is relatively easy to work out these kind of circuits because you use everything you have already learnt about series and parallel circuits. The only difference is that you do it in stages. In Figure 1, the circuit consists of 2 parallel portions that are then in series with 1 resistor. So, in order to work out the equivalent resistance, you start by calculating the total resistance of the parallel portions and then add up all the resistances in series. If all the resistors in Figure 1 had resistances of 10
We start by calculating the total resistance of Parallel Circuit 1.
The value of
We can similarly calculate the total resistance of Parallel Circuit 2:
This has now being simplified to a simple series circuit and the equivalent resistance is:
The equivalent resistance of the circuit in Figure 1 is 7,66
Series and parallel networks
Determine the equivalent resistance of the following circuits:

Figure 4 
Figure 5 
Figure 6
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