Desmos Graphing Calculator

CalcReferenceCopy

Math·Algebra·Linear equations in one variable

medium

$R=\frac{0.45\ell }{A}$

The given equation relates the resistance $R$, in ohms, of a wire to its length $\ell$, in meters, and its cross-sectional area $A$, in square meters. Which equation correctly expresses the length, in meters, of the wire in terms of its resistance, in ohms, and its cross-sectional area, in square meters?

A

$\ell =\frac{AR}{0.45}$

B

$\ell =\frac{0.45R}{A}$

C

$\ell =\frac{R+A}{0.45}$

D

$\ell =\frac{R-A}{0.45}$