What does the symbol given below denote in a circuit diagram?
Variable resistor
The symbol shown in the image denotes a variable resistor in a circuit diagram.
A variable resistor, also known as a potentiometer or rheostat, allows for the adjustment of electrical resistance within a circuit. The arrow within the symbol indicates the adjustable nature of the resistance. Unlike a fixed resistor represented by a simple zig-zag line, this symbol clearly shows a mechanism for changing the resistance value.
Let's look at why the other options are incorrect:
- Voltmeter: A voltmeter is represented by a circle with a 'V' inside, indicating a device for measuring voltage.
- Voltage source: A voltage source is typically depicted as a circle with a '+' and '-' symbol to denote the positive and negative terminals.
- Resistor: A fixed resistor is usually represented by a zig-zag line. The symbol in the image shows a modification of this to indicate adjustable resistance.
Therefore, the correct answer is a variable resistor because the image clearly displays the characteristic symbol used to represent a component with adjustable resistance in electrical circuit diagrams.
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