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It is necessary to use a milliammeter with a 20 mA scale as an ammeter for measuring currents up to 5 A.

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It is necessary to use a milliammeter with a 20 mA scale as an ammeter for measuring currents up to 5 A. Calculate the resistance of the shunt if the internal resistance of the milliammeter is 8Ω. 

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R = 0.032 ohm. The sensitivity of the instrument is 1/250 of its initial value. 

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