50Hz
The bulb in the frequency of AC mains by electrically vibrating rod acts as a visual indicator of the frequency of the vibrations produced by the rod. As the rod vibrates at the frequency of the AC mains, the bulb will flicker or light up in synchronization with the vibrations, providing a way to visually observe the frequency.
The standard household AC electrical power mains voltage in Greece is 230 volts, with a frequency of 50 Hz.
The mains voltage is 230 volts, and the frequency is 50Hz.
-- 60 Hz mains in North America, Latin America, a few other places -- 50 Hz mains in Europe, Asia, most other places -- Anything at all, from DC to daylight, depending on the application, in non-mains circuits
A cycloconverter or a cycloinverter converts an AC waveform, such as the mains supply, to another AC waveform of a lower frequency, synthesizing the output waveform from segments of the AC supply without an intermediate direct-current link.
It depends on the rectifier. For a half-wave, it's the same as the AC mains: i.e. 60 Hz mains gives 60 Hz ripple. For a full-wave or a bridge, it's twice the AC mains: 60 Hz mains gives 120 Hz ripple. Three-phase systems are more complicated, so you would need to check in an electrical engineering book.
It depends on the rectifier. For a half-wave, it's the same as the AC mains: i.e. 60 Hz mains gives 60 Hz ripple. For a full-wave or a bridge, it's twice the AC mains: 60 Hz mains gives 120 Hz ripple. Three-phase systems are more complicated, so you would need to check in an electrical engineering book.
no
The mains supply in Scotland is 50Hz.
no
The mains voltage in Cyprus is 230 volts at a frequency of 50 Hz.