When you flip a switch to turn on a light, the delay time before the light turns on is determined by a the speed of the electric field moving in the wire. b the drift speed of the electrons in the wire. c the resistance of the wire. d the number of electron collisions per second in the wire.

When you flip a switch to turn on a light, the delay time before the light turns on is determined by a the speed of the electric field moving in the wire. b the drift speed of the electrons in the wire. c the resistance of the wire. d the number of electron collisions per second in the wire.

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter28: Direct-current Circuits

Section: Chapter Questions

Problem 28.7CQ

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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

When you flip a switch to turn on a light, the delay time before the light turns on is determined by

a	the speed of the electric field moving in the wire.
b	the drift speed of the electrons in the wire.
c	the resistance of the wire.
d	the number of electron collisions per second in the wire.

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