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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
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