 ×     #### Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Click to Chat

1800-1023-196

+91-120-4616500

CART 0

• 0

MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
```
A cell of emf E is connected across a resistance R. The potential difference across the terminals of the cell isfound to be V volt. Internal resistance of cell is a] (E-V)R b] (E-V)R/V c] 2(E-V)R/E d] 2(E-V)V/R

```
2 years ago

```							Assume a circuit (with the given conditions) :Emf(E) , Internal Resistance(r), External Resistance(R)When no current is drawn from the cell :Emf(E) = Internal Potential Difference(V”) //across the plates of the emf.But, when current(i) is drawn :Emf(E) = V” + V //due to potential drop, external potential difference is obtained (V) ; as mentioned.Now, since : V” = i . r ;     Then, E = V” + V will become,>  E = (i . r) + V>  E – V = i . r>  (E – V) / i = rsince, i = V / R ;>  (E – V) / (V / R) = r>  {(E – V) . R} / V = r  //ans(b)
```
2 years ago
```							The electromotive force (e) or e.m.f. is the energy provided by a cell or battery per coulomb of charge passing through it, it is measured in volts (V). It is equal to the potential difference across the terminals of the cell when no current is flowing.E = I(R+r)E = electromotive force in volts, VI = current in amperes, AR = resistance of the load in the circuit in ohms,r = internal resistance of the cell in ohms.That is, E = IR+Ir, E = V + Ir.Rearranging the equation we get, r=RE−V​.Substituting I=V/R in the above equation, we get, r=RV​E−V​=V(E−V)R​.Hence, internal resistance r=V(E−V)R​.
```
2 months ago
Think You Can Provide A Better Answer ?

## Other Related Questions on Electric Current

View all Questions »  ### Course Features

• 101 Video Lectures
• Revision Notes
• Previous Year Papers
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Test paper with Video Solution  ### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions