Which of the following statements are true?
(A) Rheostat can be used both as a variable resistance and a potential divider.
(B) An electrical circuit is functional only if all the components of the circuit are connected in proper order, assuming that all circuit components/devices are in working condition and key is closed.
(C) An open circuit means a break in some part of a circuit which could be deliberate such as a key in open position or a fault such as broken wire or burnt out component(s) or loose connection.
(D) Rheostat as a potential divider gives variable resistance.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (A), (B) and (C) only
(A) Rheostat can be used both as a variable resistance and a potential divider. — Correct. Connected with two terminals (one end and the slider) it is a variable resistance; connected with all three terminals across the supply it is a potential divider.
(B) An electrical circuit is functional only if all the components of the circuit are connected in proper order, assuming that all circuit components/devices are in working condition and key is closed. — Correct. A break anywhere in the loop stops the current.
(C) An open circuit means a break in some part of a circuit which could be deliberate such as a key in open position or a fault such as broken wire or burnt out component(s) or loose connection. — Correct. The key in the open position, a broken wire, a burnt-out component or a loose connection all leave the path open, so no current flows.
(D) Rheostat as a potential divider gives variable resistance. — Incorrect. As a potential divider it gives a variable potential difference between the slider and one end, not a variable resistance.