First a small update to the previous episode. There, we mentioned that a decimal prefix is often written instead of the decimal point: 8.2 kΩ becomes 8kΩ2 and 5.6 nF becomes 5nF6. There we noted casually that the μ (’micro’ or 10-6) is at least tricky to find on our US/ UK keyboards. In fact the key combination is ALT+0181, but that is clumsy. That’s why instead of the μ, a ’u’ is often written and then we get: 4.7 μF = 4.7 uF = 4uF7 or even 4u7. Over to business as usual. What happens when we connect two resistors in series, as outlined in Figure 1? If we consider a resistor as a component that impedes the current flow, we could reason as follows: the current is obstructed by R1, and the small amount of current that manages to pass that resistor is obstructed again by R2. So it is obvious that the total resistance increases when connecting resistors in series. Yes we know, this reasoning is rickety but it does make some sense of what is happening.
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