A current defined by a frequency (HZ)
A periodic alternating current is characterized by its frequency, measured in hertz (Hz). It’s the number of round trips made by the electric current in one second . The most widely used form of alternating current is sinusoidal current , primarily for the commercial distribution of electrical energy.
We must distinguish:
- The purely alternative currents whose average value (DC component) is zero, which can supply a transformer without danger.
- The alternating current with non-zero direct component which cannot under any circumstances supply a transformer