The transformer is coupled to the principle of the use of magnetic

Put on a coil with alternating current, the alternating magnetic field is generated, then the alternating magnetic Voltage stabilizer the other coil, the other coil will induce a voltage, which is the principle of the transformer, the transformer and the two number number of turns of the coil; simply, the use of magnetic coupling of the transformer principle, all the original secondary winding (coil) mcb circuit breaker of the voltage across the coil is proportional to the size and the number of turns, the number of turns of the primary and secondary this ratio determines the transformer turns ratio. Obviously adapter is not the role of regulator, because the secondary voltage with primary voltage changes.
Regulator is to use the principle of negative power transformers, so to speak, the tap water faucet open the half, at the head of the outlet fitted with a sensor that detects the amount of water, if the water volume, and automatically will tap off a small point, if a small amount of water, it will automatically open a large number of taps, so that the amount of water remains constant. Regulators principles generally true, there is one in the regulator can detect a change in output voltage circuit (error amplifier inverting input resistor divider sampling circuit, which can now be reduced to only one integrated chip), when the output voltage changes, the output voltage change is detected by the chip circuitry to provide feedback to the servo motors, and then by PW motor driven arm automatically adjust the location of the brush, so that the output voltage stability, the stability of which is the easiest