The diode is flipped in each image. If the ohmmeter reads a finite resistance, that means the diode is conducting a small current in the forward direction, and the red +++ lead from the meter is touching the anode. If the resistance reads O.L (for overload), the diode is not conducting current. That means the red +++ test lead is touching the cathode.
The diode is our first semiconductor device. A diode’s distinctive feature is that it conducts current in one direction, but not the other. We won’t go into the details of how a diode does this, or how it’s made. Fortunately, you don’t have to know how to make a diode before you can use it in a circuit.
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