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Starting electronics
Figure 2.3 About the simplest circuit you could have: a single resistor and a
multi-meter. The multi-meter takes the place of a power supply, and the circuit’s
job is to test the resistor!
4) If it doesn’t cross at 0, adjust the multi-meter using the
zero adjust knob (usuallu marked 0ΩADJ).
What you’ve just done is the process of zeroing the multimeter.
You have to zero the multi-meter every time you use
it to measure resistance. You also have to do it if you change
resistance ranges. On the other hand, you never have to do
it if you use your multi-meter to measure current or voltage,
only resistance, or if you have a digital multi-meter.
You see, measurement of resistance relies on the voltages
of cells or a battery inside the multi-meter. If a new cell is in
operation, the voltage it produces may be, say, 1.6 V. But as
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