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Starting electronics
Take note — Take note — Take note — Take note
The measured result may not, unfortunately, be
exactly the same as the calculated result — due to
resistor tolerances and multi-meter tolerance.
Finally, from this measured result and Ohm’s law, the current
I may be calculated.
Hint:
Your multi-meter can be used directly to measure current (it’s a multimeter,
remember) so after building up your network of resistors you
can simply read off the current flowing. Figure 3.6 illustrates how a
multi-meter should be connected in a circuit to allow it to indicate the
current through the circuit. Note the use of the words in and through.
In chapter 1 we looked closely at current and saw that it is a flow of
electrons around a circuit. To measure the current we must position
the multi-meter in the circuit — in other words the current going
around the circuit must also go through the multi-meter. This is an
important point when measuring current. Remember it!
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