Which of the following statements are correct?
A. Electrical resistivity of copper is low.
B. Temperature coefficient of resistance for semiconductors is positive.
C. On carbon resistors, colour of the second strip indicates the multiplier.
D. During charging of a cell, the terminal potential difference becomes greater than the emf of the cell.
E. The cells are connected in series to get more voltage, than cells connected in parallel.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → A, D and E only
(A) True, Copper is known for its excellent electrical conductivity, which means it has low resistivity compared to most other metals.
(D) True, During the charging of the cell, the terminal potential difference can become greater than emf and this happens because the battery is charged against its internal resistance.
(E) True, when cells are connected in series, their voltage add up, providing a higher overall voltage.