why 60 hz is used in usa?
3429
The use of 50 versus 60 Hz is purely due to historical reasons, with companies in the US making 60 Hz equipment and those in Europe making 50Hz equipment so that they have a monopoly. This rivalry led to the split you see today.
326770
Induction motors turn at a speed proportional to frequency, so a high frequency power supply allows more power to be obtained for the same motor volume and mass. Transformers and motors for 400 Hz are much smaller and lighter than at 50 or 60 Hz, which is an advantage in aircraft (and ships).
1463249
But before you whip out your credit card, we have a word of warning: extra hertz may not mean better picture quality. ... HDTVs whose LCD panels had at least a 120-Hz refresh rate generally did better than sets with a baseline rate of 60Hz. Yet the improvement from 120Hz to 240Hz was less dramatic.
29408
Electricity. Outlets and voltage (110 volts) are the same as in the United States. ... For those from other countries, adapters are required for electrical appliances. The frequency of electrical current in Canada is 60 Hz.
1402073
Hold up just a second. You might not be. Many TVs today are 60Hz, despite having "motion rates" and "effective refresh rates" claiming much higher numbers, including 120, 240 and more. ... A true 120Hz refresh rate can improve the picture quality a bit by reducing motion blur.
674035
India got 50Hz, because it was colonized by England, which when they developed their electrical systems, choose 50 Hz. ... 50/60 HZ is an optimum frequency which keeps the transmission losses to tolerable limits. The higher will be the frequency, the more will be the losses.
265057
1 kHz just happens to be the tone audio adopted as a reference....so you could say, "0 dB VU was calibratet using a 1 kHz tone at +4dBm reference level." Other frequencies can and do get used also as reference tones....but 1 kHz is the one used most often in a variety of audio applications.
142722
E Series is 60hz whereas the M is 120Hz at that size. Much better motion and interpolation with 120Hz. Dimming zones lead to better contrast and better picture quality in different lighting conditions.
258030
1 fps equals 1 Hz. If you were to do a frame rate comparison between a 60 Hz monitor and a 120 Hz monitor, you may not notice a significant difference, despite one being twice as fast as the other.
1153283
As a general rule, if you're not gaming, 60 Hz is fine. If you are gaming, you want the highest refresh rate and the lowest response time you can afford.
1427496
In Mexico the standard voltage is 127 V and the frequency is 60 Hz. You can use your electric appliances in Mexico, because the standard voltage (127 V) is (more or less) the same as in the United States of America (120 V). Manufacturers take these small deviations into account.
87533
The Volt/Hz ratio is calculated by taking the rated voltage of the drive (such as 460 Volts) and dividing by the line frequency (typically 60 Hz or 50 Hz). For example, a 460 Volt drive running on 60 Hz has a ratio of: 460 V / 60 Hz = 7.67 V/Hz.
658402
In the technical specifications, you'll usually see it measured in hertz (Hz) – the higher the number, the more times per second the image refreshes on your screen. This makes the picture smoother and less blurry. ... 50Hz – gives a smooth picture and is good for general viewing.
799262
1 Revolution per minute is equal to 1/60 Hertz. RPM is commonly used to measure engine performance. Period is the inverse of frequency. 1 RPM = 1/60 Hz or approximately 0.0166666666666667 Hz.
1086926
Hertz(Hz) is the number of images displayed per second every time the monitor refreshes. This means that a 60Hz monitor will refresh images and return 60 images per second while a 120Hz monitor returns 120 images per second every time it refreshes.
703674
When a 60 Hz sinusoidal voltage is applied to the input of a half-wave rectifier, the output frequency is. The rectifier is used to convert the ac (alternating current) input voltage to pulsating dc (direct current) voltage. The half-wave rectifier circuit consists of diode, ac source and load resistor.
139550
At that time, Motors are invented and scientists found that if we decrease the frequency of the electric supply, the eddy-current loss and hysteresis loss will gradually decrease. Therefore, the scientists decided to use 50 Hz instead of 60 Hz to reduce those losses.