To what scale should the ammeter be set in order to read a current of 2000 mA?

To effectively measure a current of 2000 mA, which is equivalent to 2 A, the scale of the ammeter should be set to accommodate this value. Selecting a scale that is too low would not only be ineffective but could potentially damage the ammeter.

Setting the ammeter to a scale higher than 2 A ensures that the device can accurately read the current without risk of overloading. A 10 amp scale provides sufficient range to capture 2000 mA while allowing for any potential fluctuations in the current without exceeding the meter's capacity.

Choosing the 10 amp scale also ensures better accuracy, as it allows for readings to be taken within a safe operating range, providing a clearer gauge of current flow without being at the maximum limit of the scale. While a 5 amp scale could also read 2000 mA, it would be very close to its maximum capacity, which can lead to less precise readings or the risk of damaging the device.