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Electric Circuit and Circuit Diagram

Which of the ...

Question

Which of the following instruments does not have plus (+) or minus (–) sign marked on it while representing in a circuit diagram?
(1) Rheostat
(2) Voltmeter
(3) Ammeter
(4) Cell

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Solution

A rheostat is a variable resistor and for a resistor, either terminal can be connected to either side of the circuit. That's why a rheostat does not have a positive or negative sign marked on it while representing in a circuit diagram.

Hence, the correct answer is option 1.

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