Which of the following symbols represents a rheostat?
A zigzag line with an arrow which is drawn across it.
In standard circuit diagrams, a fixed resistor is shown as a zigzag line. A rheostat (variable resistor) is shown as a zigzag line with an arrow drawn diagonally across it, indicating that the resistance can be varied by sliding a contact.
An ammeter is an 'A' inside a circle. A voltmeter is a 'V' inside a circle. A simple zigzag line without the arrow represents a fixed resistor, not a variable one.
The correct answer is : A zigzag line with an arrow which is drawn across it.
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