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# What is Frequency

In statistics the frequency (or absolute frequency) of an event is the number of times the event occurred in an experiment or study. These frequencies are often graphically represented in histograms.
Published in Chapter:
Power Quality of Electrical Power Systems
Feras Youssef Mahfoud (Universitatea Politehnica Bucureşti, Romania), Basarab Dan Guzun (Universitatea Politehnica Bucureşti, Romania), George Cristian Lazaroiu (University Politehnica of Bucharest, Romania), and H. H. Alhelou (Tishreen University, Syria)
DOI: 10.4018/978-1-5225-8030-0.ch011
Abstract
Power quality problems can cause processes and equipment to malfunction or shut down. And the consequences can range from excessive energy costs to complete work stoppage. Obviously, power quality is critical. There are many ways in which a power feed can be poor quality, and so no single figure can completely quantify the quality of a power feed. In this chapter, the authors present all definitions, classifications, and problems related to power quality. Finally, they do a comparison between the practical measurements and standards related to power quality.
More Results
Number cycle repetitions that occur within one second.
The number of waves that have passed a fixed length at a given time; the cable should provide a certain frequency range to the broadcast signal; therefore cables are tested at the required frequencies.
Term (action) frequency captures how salient an action is within a sequence. Sequence frequency refers to the number of sequences that contain a certain action.
Frequency is the number of repetitions of a complete wave within 1 second; 1Hz equals one complete waveform in 1 second, and 1KHz equals 1,000 waves in a second.
Number of occasions that a consumer purchases a particular product during a period of time. Average annual purchases of a product.
The number of times that something repeats in a unit of time. Electrical frequency is the rate of oscillation between two levels of voltage. This is expressed as number of cycles per second or Hz.
The average number of times an advert was served to a user.
Occurrence of no of times word appear during the text processing.
The count of number of disease in various categories.
Frequencies constitute the rate at which electromagnetic waves, such as light, television, and radio waves, oscillate. Electromagnetic waves are comprised of a continuum of emanations, including light waves which are visible, and invisible frequencies such as television and radio waves which are lower frequency than light, and x-rays and gamma rays which are higher frequency. Frequencies are measured in Hertz (Hz), kilohertz (kHz), megahertz (MHz), or gigahertz (GHz), and represent the rate of oscillation of the waves.
It is the magnitude that measures the number of repetitions per unit of time of any phenomenon or periodic event.
Number of oscillations per second expressed in Hertz (Hz). For the voice, the frequency corresponds to the number of opening and closing phases per second of the vocal folds.
Is the number of occurrences of a repeating event per unit time. For counts per a time interval, the unit of frequency is the hertz (Hz), 1 Hz means that an event repeats once per second.