Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 12-science Answered

explain slow electrons and fast electricity concept.. why electricy travel fast whereas the electron in it have very low velocity.
Asked by broprint18 | 05 Jun, 2020, 09:45: AM
answered-by-expert Expert Answer
To understand the concept of drift velocity of lectrons let's consider the example when an electrical appliance (let's say an electric bulb) turns on immediately once the switch is turned on. 
The explanation for the same is as follows: -  
The electron drift velocity is the average velocity that an electron, attains due to an electric field. Due to the collision between the electrons, the average velocity ie electron drift velocity is very small. when the switch is on, an electric field is established at a speed of light, it exerts an electric force on every free electron in the conductor that makes them all move with a large acceleration. In other words, the electric field takes place with the speed of light and the free electrons everywhere in the wire begin drifting almost at once. So, though the electron drift velocity is very small but electric bulb lights instantly when switched on.
Answered by Shiwani Sawant | 05 Jun, 2020, 08:56: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 12-science - Physics
what is drift velocity
Asked by deepajinder | 05 May, 2022, 08:33: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
the number of electrons striking the screen of CRT is 7.5×10^15 in 10 sec. calculate the electric current
question image
Asked by saishankar160 | 10 Feb, 2022, 09:57: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
A semiconductor slab of thickness t=0.5 mm with length l=30 cm carrying current I=2A placed in a magnetic field B=0.25T directed into the page, perpendicular to the flat surface of the slab carries 7*10^24 electrons per m^3. Calculate the Hall voltage across the slab. Indicate which edge (top or bottom) is at higher potential and why?
Asked by arjunsah797 | 26 Jan, 2022, 02:56: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
drift velocity is directly proportional to
Asked by nonuhasan2 | 23 Nov, 2021, 02:18: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
What is resistance?
Asked by pappuchandra017 | 16 Feb, 2021, 03:56: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
If the temperature of a conductor decreases,how does the relaxation time of electrons in the conductor change?
Asked by krunalgoti2004 | 10 Aug, 2020, 12:21: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
explain slow electrons and fast electricity concept.. why electricy travel fast whereas the electron in it have very low velocity.
Asked by broprint18 | 05 Jun, 2020, 09:45: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
How does a metal conduct electricity?
Asked by kumarisweta10012004 | 10 Oct, 2019, 12:31: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Obtain the relation between the terms drift velocity, relaxation time and electric field
Asked by Harimahi73 | 21 Feb, 2019, 08:53: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Current flows from a point that has higher electrical potential to a point of lower electrical potential potential ,didn't understand  
Asked by Avadhut Katkar | 21 Aug, 2018, 05:03: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Grab Our Exam Special Offer-Enrol now!
×