Power supply needs vary from country to country, depending on the voltage and frequency (hertz) used.
Ultra high frequency | Frequency modulation | frequency | High frequency | Very high frequency | Sport utility vehicle | frequency modulation | Extremely high frequency | utility cooperative | electric utility | Radio-frequency identification | Medium frequency | Frequency | Cambridge Low Frequency Synthesis Telescope | ultra high frequency | Super high frequency | public utility | National Association of Regulatory Utility Commissioners | low frequency | Frequency Modulation | Frequency-division multiplexing | FreQuency | Utility software | Utility pole | Utility frequency | sport utility vehicle | Saddlehorn Utility Area Historic District | Orthogonal frequency-division multiple access | Nyquist frequency | Modified Frequency Modulation |
These parameters may include, for example, current and voltage RMS, phase relationship between waveforms of a multi-phase signal, power factor, frequency, THD, active power (KW), reactive power (Kvar), apparent power (KVA) and active energy (KWh), reactive energy (Kvarh) and apparent energy (KVAh) and many more.