Electronics guide > On the boards > More and more complex circuits
More and more complex circuitsCircuits we’ve looked at so far have been very simple, really. Much more complex
ones await us over the coming chapters. We’ll also be introduced to several new
components, such as capacitors, diodes, transistors, and ICs. Fortunately, most
of the new circuits and components follow these basic laws we’ve studied, so you’ll
be able to understand their operation without much ado.
The aim of these basic laws is to simplify complex circuits so that we may understand
them and how they work, with reference to the circuits we have already seen. For
example, the circuit in Figure 2.9 is quite complex. It consists of many resistors
in a network. But by grouping the resistors into smaller circuits of only series
and parallel resistors, it’s possible to simplify the whole circuit into one overall
resistance.
In fact, I’m going to leave you with that problem now. What you have to do, is
to calculate the current, I, which flows from the battery. You can only do that
by first finding the circuit’s overall resistance. If you can’t do it by calculation
you can always do it by building the circuit up on breadboard and measuring it.
Resistor and multi-meter tolerances, of course, will mean the measured result may
not give exactly the same result as the calculated one.
Figure 2.9 A comparatively complex circuit showing a number
of resistors in parallel and in series. By breaking the circuit down into groups,
the overall resistance can be calculated
Meanwhile, there’s always the quiz over the page to keep you occupied!
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