Your question is akin to asking how many beef steaks are there in an orange! The ampere (not amp!) is used to measure electric current; the hertz is used to measure frequency. These are two completely different quantities and do not equate to each other!
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The unit of frequency, such as 50 Hz in this case, refers to the number of cycles per second. Amps, on the other hand, represent current flow in a circuit. The frequency (Hz) and current (Amps) are two different electrical quantities and are not directly related to each other.
AC is alternating current. Or the voltage output changes from + to - USA uses 120 V AC 60 HZ as the normal plug power. Or the 120 V positive will go negative then positive every 1/60 seconds. Or the change will happen 60 times per second. Japan Uses 110V 50 Hz. That why a lot of the AC appliances that can be used in Japan or the US will be marked for both.
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.
50 milliamps (mA) is equal to 0.05 amps.
in a home6000/120= 50 ampswatts/volts=amps
On a 50 amp 3 phase connector, you can pull 50 amps per leg. This means that each of the three phases can carry up to 50 amps individually, resulting in a total capacity of 50 amps per leg.
To calculate the amperage, use the formula: Amps = Watts / Volts. In this case, 50 watts / 12 volts = 4.17 amps. So, a 50 watt 12V light will draw approximately 4.17 amps of current.