There is no 'formula' which defines the ampere. The ampere is defined in terms of the resulting force between two parallel, current-carrying, conductors, due to the magnetic fields surrounding those conductors.
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To convert high voltage (HV) amps to low voltage (LV) amps, you can use the formula: HV amps = LV amps x (LV voltage / HV voltage). By rearranging the formula, you can calculate LV amps by dividing HV amps by the ratio of HV voltage to LV voltage.
To convert watts to amps, use the formula: Amps = Watts / Volts. So, 9000 watts at 220 volts would be: 9000 / 220 = 40.91 amps.
To calculate amps, you can use the formula: Amps = Watts / Volts. In this case, 500 watts divided by 120 volts equals approximately 4.17 amps.
To convert kilowatts to amps, you can use the formula: Amps = Kilowatts / (Volts x √3). In this case, it would be Amps = 2800 kW / (525 V x √3) ≈ 3.86 A.
To convert VA to amps, you can use the formula Amps = VA / Volts. In this case, Amps = 140 VA / 240 V = 0.5833 Amps.