# How long does it take electrons to get from a car battery to the starting motor? Assume the...

## Question:

How long does it take electrons to get from a car battery to the starting motor? Assume the current is {eq}260 \, \mathrm{A} {/eq} and the electrons travel through a copper wire with cross-sectional area {eq}0.200 \, \mathrm{cm^2} {/eq} and length {eq}0.860 \, \mathrm{m} {/eq}. The number of charge carriers per unit volume is {eq}8.49 \times 10^{28} \, \mathrm{m^{-3}} {/eq}.

## Current:

The amount of charge Q passing through the cross-section of a conductor in unit time gives us the current in through the conductor.

{eq}\displaystyle I=\frac{Q}{t} {/eq}.

t is the time of flow of current

Given:

Amount of current flowing i = {eq}260 \, \mathrm{A} {/eq}.

Cross-sectional area of the copper wire is

{eq}A = 0.200 \, \mathrm{cm^2} =...

Become a Study.com member to unlock this answer! Create your account