an ammeter has a resistance of 0.006Ω and reads one ampere per scale division. what shunt resistance will make it read 3A per scale division?
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If its current reading is to become 3 A per scale division in place of 1 A, then its effective resistance should become 1/3rd, that is 0.002ohm
So 1/0.002 - 1/0.006 = 1/R, R 0.003 ohms to be added as shunt.
So 1/0.002 - 1/0.006 = 1/R, R 0.003 ohms to be added as shunt.
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