Answer
$1.3\times10^{21}\frac{e^-}{minute}$
Work Step by Step
Find the current first from equation 18–2, which defines the resistance.
$$I=\frac{V}{R}=\frac{4.5V}{1.3\Omega}=3.462A$$
Find the number of electrons per minute from the current.
Use the definition of current, equation 18–1.
$$I=\frac{\Delta Q}{\Delta t}$$
$$3.462A=\frac{3.462C}{s}\frac{60s}{minute}\frac{1\;e^-}{1.60\times10^{-19}C}=1.3\times10^{21}\frac{e^-}{minute}$$