For example, the voltage on the inductor in the AC circuit is proportional to the frequency, the voltage on the capacitor is inversely proportional to the frequency, and there will be peak and valley values in the series and parallel circuit of the inductor and capacitor, that is, the so-called \"resonance\". The frequency affects the speed of the rotating motor and, indirectly, also affects its output. The cycle itself is determined by the speed of the generator. The change of frequency depends on the real-time balance of active power in the system, when the active power emitted by the generator is greater than the active power consumed by the load, the generator will accelerate, the frequency will increase, and on the contrary, it will slow down and reduce.
In other words, frequency is the number of voltage changes per second
In China, the power frequency is 50HZ, that is to say, the voltage from positive voltage to negative voltage, and then from negative voltage to positive voltage, this process is one second after 50 times, (generally change the voltage into current).