Question
Medium
Solving time: 4 mins
(a) Six lead-acid type of secondary cells each of emf 2.0 V and internal resistance are joined in series to provide a supply to a resistance of . What are the current drawn from the supply and its teral voltage?(b) A secondary cell after long use has an emf of 1.9 V and a large internal resistance of . What maximum current can be drawn from the cell? Could the cell drive the starting motor of a car?
Found 4 tutors discussing this question
Discuss this question LIVE
9 mins ago
Text solutionVerified
(a)
Total resistance in circuit =
Total EMF,
So current in the circuit
Terminal voltage,
(b)
The current will be . It is impossible to start a motor because a starter motor requires large current (100 A) for a few seconds
Was this solution helpful?
16
Share
Report
One destination to cover all your homework and assignment needs
Learn Practice Revision Succeed
Instant 1:1 help, 24x7
60, 000+ Expert tutors
Textbook solutions
Big idea maths, McGraw-Hill Education etc
Essay review
Get expert feedback on your essay
Schedule classes
High dosage tutoring from Dedicated 3 experts
Practice more questions from Physics Part-I (NCERT)
Q1
The earths surface has a negative surface charge density of . The potential difference of 400 kV between the top of the atmosphere and the surface results (due to the low conductivity of the lower atmosphere) in a current of only 1800 A over the entire globe. If there were no mechanism of sustaining atmospheric electric field, how much time (roughly) would be required to neutralise the earths surface? (This never happens in practice because there is a mechanism to replenish electric charges, namely the continual thunderstorms and lightning in different parts of the globe). (Radius of earth = m.)
Q2
(a) Six lead-acid type of secondary cells each of emf 2.0 V and internal resistance are joined in series to provide a supply to a resistance of . What are the current drawn from the supply and its teral voltage?
(b) A secondary cell after long use has an emf of 1.9 V and a large internal resistance of . What maximum current can be drawn from the cell? Could the cell drive the starting motor of a car?
Q3
Two wires of equal length, one of aluium and the other of copper have the same resistance. Which of the two wires is lighter? Hence explain why aluium wires are preferred for overhead power cables. , Relative density of Al = 2.7, of Cu = 8.9.)
View allPractice questions from Physics Part-I (NCERT)
Question 1
Medium
Views: 6,420
Question 2
Medium
Views: 6,251
Question 3
Medium
Views: 6,316
(c) What happens if the galvanometer and cell are interchanged at the balance point of the bridge? Would the galvanometer show any current?
Question 4
Medium
Views: 5,768
Practice more questions from Current Electricity
Question 1
Easy
Views: 5,826
(a) In a balanced Wheatstone bridge, if the cell and the galvanometer are exchanged, the null point is disturbed
(b) A rheostat can be used as a potential divider
(c) Kirchhoff's second law represents energy conservation
(d) Wheatstone bridge is the most sensitive when all the four resistances are of the same order of magnitude
Question 2
Medium
Views: 6,170
1. The voltmeter reading will be
2. The resistance of the voltmeter is
Practice questions on similar concepts asked by Filo students
Question 1
Views: 5,472
Question 2
Views: 5,985
Question 3
Views: 5,602
Stuck on the question or explanation?
Connect with our Physics tutors online and get step by step solution of this question.
231 students are taking LIVE classes
Question Text | (a) Six lead-acid type of secondary cells each of emf 2.0 V and internal resistance are joined in series to provide a supply to a resistance of . What are the current drawn from the supply and its teral voltage? (b) A secondary cell after long use has an emf of 1.9 V and a large internal resistance of . What maximum current can be drawn from the cell? Could the cell drive the starting motor of a car? |
Topic | Current Electricity |
Subject | Physics |
Class | Class 12 |
Answer Type | Text solution:1 |
Upvotes | 16 |