Request a call back

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

CBSE Class 12-science Answered

why during discharging: Terminal p.d. V < emf E. V = E-Ir During recharging: Terminal p.d. V > emf E. V = E+Ir?? why???why??
Asked by imattop | 24 Feb, 2011, 12:00: AM
answered-by-expert Expert Answer
Dear student,
 
Electromotive force is the voltage of your battery.
It is the MAXIMUM voltage the circuit can attain. So, when you place a voltmeter in parallel to your battery/cell, the reading shown is your Electromotive Force, or EMF.

Whereas, PD or potential difference is simply the difference of the voltage before and after experiencing a resistance effect. So basically, the potential difference can never be equal to the EMF in a circuit because there is always energy lost as heat, or some other form.
 
1) during discharge: terminal V < emf, due to the voltage drop from internal resistance
2) during recharge: terminal V > emf, due to restoration of potential difference across the terminals of the battery (i.e. voltage source)
 
Hope this helps.
Team
Topperlearnin g.com
Answered by | 01 Mar, 2011, 10:20: AM
CBSE 12-science - Physics
Asked by mailtoanjalip2005 | 16 Mar, 2024, 08:22: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by patelnamra608 | 26 Jan, 2024, 11:01: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by shivashikhar69 | 09 Dec, 2023, 02:27: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by nikhilsai2616 | 19 Nov, 2023, 01:05: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by snehashiragannavar773 | 21 Oct, 2023, 02:38: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by dr.strange45678 | 02 Aug, 2023, 12:31: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by komalbrar0987 | 17 May, 2023, 06:15: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by whoami230302 | 17 Jan, 2023, 03:48: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Physics
Asked by amanpanday6384 | 22 Dec, 2022, 12:42: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×