Test the PiSmart fuse tutorial
1. Turn the multimeter to the position shown below.
2. Use the red and black test leads of the multimeter to test the on/off
of the components in the figure below. The red and black test leads
are respectively in contact with the two ends of the component (the
component has "P" written on it).
When the multimeter has a sound, it indicates that PiSmart's fuse is
good, if not, it indicates that PiSmart's fuse is bad.