EASY
12th Tamil Nadu Board
IMPORTANT
Earn 100

A battery consists of a variable number (n) of identical cells, each having an internal resistance r connected in series. The terminal of the battery is short-circuited. A graph of current versus the number of cells will be as shown in figure.

50% studentsanswered this correctly

Important Questions on Current Electricity

EASY
12th Tamil Nadu Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Current Electricity>Exercise>Q 21
In the electric circuit shown, each cell has an emf of 2 V and internal resistance of 1 Ω. The external resistance is 2 Ω. The value of the current I is (in ampere)

Question Image
EASY
12th Tamil Nadu Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Current Electricity>Exercise>Q 22
It is possible that any battery has some constant value of emf, but the potential difference between the plates is zero?
EASY
12th Tamil Nadu Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Current Electricity>Exercise>Q 23
A low voltage supply from which one needs high currents must have very low internal resistance. Why?
EASY
12th Tamil Nadu Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Current Electricity>Exercise>Q 24
A high tension (HT) supply of, say, 6 kV must have a very large internal resistance. Why?
HARD
12th Tamil Nadu Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Current Electricity>Exercise>Q 25
A cell of emf 4 V is connected to two resistance 10 Ω each joined in parallel. Find the internal resistance of the cell if the current flowing through it is 0.3 A.
EASY
12th Tamil Nadu Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Current Electricity>Exercise>Q 26
Explain the difference between terminal voltage and emf of a cell.
HARD
12th Tamil Nadu Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Current Electricity>Exercise>Q 27
There are two cells of emf ε1 and ε2 and internal resistance r1 and r2 respectively connected in parallel. Then find out the equivalent emf and equivalent internal resistance of this combination. If external resistance R is connected to this combination, then find out the value of electric current flowing through R.
HARD
12th Tamil Nadu Board
IMPORTANT
Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 2 - Current Electricity>Exercise>Q 28
A car battery with a 12 V emf and an internal resistance of 0.030 Ω is being charged with a current of 40 A. What are (a) the potential difference V across the terminals, (b) the rate Pr of energy dissipation inside the battery, and (c) the rate Pemf of energy conversion to chemical form? When the battery is used to supply 40 A to the starter motor, what are (d) V and (e) Pr?