In a large flashlight, the distance from the on-off switch and the light bulb is 10.8 cm. (a) Calculate the drift velocity for the electrons to drift this distance if the flashlight wires are made of copper, with a radius of 0.511 mm, and carry a current of 1.1 A? There are 8.49X1028 electrons per unit m³. Drift velocity, Vi m/s (b) How long does it take an electron to travel the distance from the on-off switch to the light-bulb? Time, t: min (c) Does this time seem reasonable? Does it explain why the flashlight starts instantly? Reflect on these questions.

In a large flashlight, the distance from the on-off switch and the light bulb is 10.8 cm. (a) Calculate the drift velocity for the electrons to drift this distance if the flashlight wires are made of copper, with a radius of 0.511 mm, and carry a current of 1.1 A? There are 8.49X1028 electrons per unit m³. Drift velocity, Vi m/s (b) How long does it take an electron to travel the distance from the on-off switch to the light-bulb? Time, t: min (c) Does this time seem reasonable? Does it explain why the flashlight starts instantly? Reflect on these questions.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Microscopic view of current

In physics, the term current is expressed as the rate of flow of electric charges across the area per unit time (I=q/t). It propagates along in the direction of the motion of positive charges. When the current is caused by the motion of electrons, the direction of the current is opposite to the flow.

Question

In a large flashlight, the distance from the on-off switch and the light bulb is 10.8 cm.
(a) Calculate the drift velocity for the electrons to drift this distance if the flashlight wires are made
of copper, with a radius of 0.511 mm, and carry a current of 1.1 A? There are 8.49X1028 electrons per
unit m³.
Drift velocity, Vi
m/s
(b) How long does it take an electron to travel the distance from the on-off switch to the light-bulb?
Time, t:
min
(c) Does this time seem reasonable? Does it explain why the flashlight starts instantly?
Reflect on these questions.

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