A fully charged battery has a supply of about 12.6 volts. Any use of electricity will lower that voltage. When the battery voltage drops to this level, the voltage regulator activates the alternator to charge the voltage. Batterai requires an alternator output of about 14.2 volts to make batteries return to 12.6 volts. Alternative voltage regulator cycle is ON and OFF 700 times per minute. During high electric current requirements, the alternator remains on for a longer time. During low current requirements, the alternator changes freely and no output is generated.
AC generator, or alternator capable of meeting this need. The comparison of an alternator and an AC generator is simply shown in Figure 1.9
a. A simple AC generator b. Simple alternator
Figure 1.9 comparison of generator and alternator construction simply
When the magnetic flux is cut off by the electrical conductor, the electromotive force will occur inside the conductor, and a flow will flow if the conductor is part of a complete circuit. As shown in Figure 1.10, the galvanometer needle (an ammeter activated by the smallest amount of current) will move because of the electromotive force created when rotating shafts rotate and the magnetic field between the north and south cuts the conductor.
From this activity it will be seen that:
- The galvanometer needles will move if the conductor or magnet is moved.
- The direction to which the needle deviates will vary according to the direction to which the conductor or magnet is moved.
- The range of needle deflection will be greater than the speed of movement.
- The needle will not move if the rotor shaft or conductor motion is stopped.
If, for some reason, causes the conductor through the magnetic flux, the electromagnetic force will occur within the conductor. This phenomenon is referred to as “electromagnetic induction”. Generators produce electromotive forces by means of electromagnetic induction, and convert them into electrical power (voltage / voltage and current).