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Electrical Circuits and Formulae

Ammeter Shunt

The resistance RP to be connected in parallel with an ammeter of full scale current IA and full scale voltage drop VA to increase the full scale current to I is:

RP = VA / (I - IA)

The power P dissipated by the resistance RP with voltage drop VA carrying current (I - IA) is:

P = VA2 / RP = VA(I - IA) = (I - IA)2RP