How R=V/I become ∆R/R = ∆V/V + ∆I/I where R is resistance, V is voltage and I is current. How it derive to ∆R/R = ∆V/V + ∆I/I?

College Physics
10th Edition
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter17: Current And Resistance
Section: Chapter Questions
Problem 10CQ: Power P0 = I0 V0 is delivered to a resistor of resistance R0. If the resistance is doubled (Rnew =...
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How R=V/I become ∆R/R = ∆V/V + ∆I/I where R is resistance, V is voltage and I is current. How it derive to ∆R/R = ∆V/V + ∆I/I?

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Why divide the eqn 2 by eqn 1?

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