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.
Similar Questions
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If an electric heater consumes 1000 W of power, how much electrical energy does it use in 1 hour?
According to the right-hand thumb rule, if the thumb points in the direction of current, then the fingers show:
A straight conductor carrying current is placed parallel to a uniform magnetic field. The force on the conductor will be:
Important Questions from Current Electricity
_______ is a simple device that is used to either break the electric circuit, or to complete it.
When the material is cooled down under its critical temperature, which of the superconductor attains accidentally zero?
The most commonly used electrical conductor is-
The gas usually filled in the electric bulb is
_________ is the physical quantity of the substance which is numerically equal to the resistance of a rod of that substance which is 1 m long and 1 sq m in cross-section.
