Basic Meter Terminology And Testing Procedures - Graco FinishPro 390 Repair Electrical Manual

BASIC ELECTRICAL TERMINOLOGY
In any discussion of electricity, there are three basic terms you will need to understand.
CURRENT
VOLTAGE
RESISTANCE
CURRENT:
Current is the movement of the electrical charge.
Current Flows through the wires from the power source to the load.
Current is measured in AMPERES (AMPS, A or I). See Figure 1.
NOTE: Meter is only clamped around one wire.
ON/OFF
Switch
Ref 58
Power
Plug
VOLTAGE:
Voltage is the force that causes current to fl ow in a circuit.
Voltage is measured in VOLTS (V or E). See Figure 2.
120 AC
V
Black
Green
Red (+)
Black (–)
from Motor
ON/OFF
Switch
Ref 58
Power
Plug
Black
White
Potentiometer Ref 37
Black
Green
Red (+)
Motor
Black (–)
FIGURE 1
FIGURE 2
Black
White
3