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E=I(R+r) solve for R
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E=I(R+r) solve for R

User Adalcar
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2 Answers

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divide I from both sides then subtract r from both sides, too so in the end:

R= (E-r)/I
User Sean Gillespie
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5 votes
E÷I =R+r

R=(E÷I) - r
User Robthewolf
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