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The absolute maximum current is used as part of a rating system, particularly for electronic components. It is a figure that a manufacturer will quote to indicate how much current can pass into or out of a device or a specific connection on the device. Exceeding that limit is likely to damage the device. The absolute maximum value is one that should never be exceeded but it is also normally higher than the maximum recommended current. The value is often measured during tests rather than calculated.
The question might refer to the amount of current that might be drawn by a device. In this instance, to calculate the absolute maximum current that a device or component might draw there are two pieces of information needed. The first is the voltage that is applied to the device. The second is the lowest possible resistance that the device can have. Devices such as resistors, filament lamps and heaters have a constant resistance but active devices such as amplifiers, computers etc. can change resistance as they operate. It can be hard to find the resistance with some devices but once it has been established, Ohm's Law can be used to calculate the maximum current using the equation current = Volts divided by resistance. It is normally much easier to measure the current using an ammeter rather than trying to find the lowest resistance.
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