## College Physics (4th Edition)

(a) $R = 15~\Omega$ (b) $R = 10~\Omega$
(a) We can find the resistance at point 1: $V = I~R$ $R = \frac{V}{I}$ $R = \frac{0.3~V}{0.02~A}$ $R = 15~\Omega$ (b) We can find the resistance at point 2: $V = I~R$ $R = \frac{V}{I}$ $R = \frac{0.4~V}{0.04~A}$ $R = 10~\Omega$