The important points of this chapter are summarized in the following summary. You should be
familiar with these points before continuing with the study of electricity.
CIRCUIT MEASUREMENT is used to monitor the operation of a piece of electrical or electronic
equipment and determine the reason the equipment is not functioning properly. In-circuit meters monitor
the operation of equipment and out-of-circuit meters can be used on more than one device.
A compass will react to the magnetic field around a conducting wire. As the current increases, the
compass movement increases. If the current decreases, the compass movement is less. If the current
direction changes, the compass movement changes direction. PERMANENT-MAGNET
MOVING-COIL meter movement (dArsonval movement) uses the interaction of magnetic fields to