Which one among the following is the true representation of (i) variable DC potential (ii) rheostat and (Hi) AC ammeter respectively?

The circuit symbols for electrical components are standardized to ensure clarity in schematic diagrams. A variable DC potential (or variable voltage source) is represented by the standard DC battery symbol (parallel long and short lines) with a diagonal arrow across it, indicating adjustability [1]. A rheostat, which is a two-terminal variable resistor used to control current, is represented by a zig-zag line (IEEE) or a rectangle (IEC) with a diagonal arrow or a sliding contact arrow [1]. An AC ammeter is represented by a circle containing the letter 'A' with a tilde (~) symbol underneath or inside it, where the tilde denotes alternating current (AC). Option 1 correctly aligns these three symbols in the specified order: variable DC source, rheostat, and AC ammeter.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > 11.3 CIRCUIT DIAGRAM > p. 175