140 Electrical Power Systems Technology
BASIC GENERATOR OPERATION
As stated previously, the operation of the electrical generators used
today depends upon the principle of electromagnetic induction. When con-
ductors move through a magnetic field, or when a magnetic field is moved
past conductors, an induced current develops. The current that is induced
into the conductors produces an induced electromotive force or voltage.
Left-hand Rule
We can determine the direction of current flow through a moving
conductor within a magnetic field by using the left-hand rule. Refer to
Figure 6-2 and use your left hand in the following manner:
- Arrange your thumb, forefinger, and middle finger so that they are at
approximately right angles to one another. - Point your thumb in the direction of conductor movement.
Figure 6-2. Left-hand rule of induced current