Not used in Pakistan: frequencies other than 50 Hz. For domestic and small businesses: voltages other than 220 v.
If your device uses 900 Watts at 7.5 Amps, then it requires 120 volts. If you want to use it where the supplied current is 220 volts, then you'll need a transformer - but only if the device can operate on 50 Hz. Most places that use 220 Volts supply it at 50 Hz. If your device says it can operate on 50 Hz you can use a transformer.
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This is straight from Wikipedia Delta up to 4 Hz Theta 4 - 7 Hz Alpha 8 - 12 Hz Beta 12 - 30 Hz Gamma 30 - 100 + Hz {| ! ! ! ! ! ! | |}
No. Lots of countries use 50 hertz for their national electricity services.
You cant. Hz measures frequency, where as Watts is a measurement of power.
220VAC at 50Hz
50 Hz 220 V
Using a standard frequency makes it easier to acquire all forms of electrical equipment. European countries decided to use 50 Hz when electricity supplies started, while most American countries have always used 60 Hz. Japan uses both 50 and 60 Hz. Pakistan decided to go with the European standard. 50 Hz gives a slightly lower transmission loss over long distances, but the transformers and other magnetic components have to be made 20% larger than for 60 Hz.
Voltage in India is 230V / 50 Hz
There are other frequencies, such as 60 Hz, 25 Hz, and 400 Hz in common use. Please restate the question - it does not make sense.
Yes, but the drill will run slower.
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monitor Refreash rate of the monitor or of memory use CPS which is Hz.
230V/50Hz
Aircraft use 400 Hz for their power supplies because it allows them to use smaller and lighter components.
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If your device uses 900 Watts at 7.5 Amps, then it requires 120 volts. If you want to use it where the supplied current is 220 volts, then you'll need a transformer - but only if the device can operate on 50 Hz. Most places that use 220 Volts supply it at 50 Hz. If your device says it can operate on 50 Hz you can use a transformer.