In schematic diagrams, how do you identify a resistor symbol?

In schematic diagrams, how do you identify a resistor symbol?

• A. Typically a zigzag line (in older drawings) or a rectangle in modern symbols, with value annotated.
• B. Always a circle with a letter R.
• C. A straight line with arrows.
• D. A triangle with a line.

Answer: (A)

Resistors are two-terminal passive components, and their symbol is designed to be a distinct two-terminal element in schematics. In older drawings it’s shown as a zigzag line between two connection points; in many modern diagrams it’s drawn as a simple rectangular block. The key is that the symbol represents a resistance between two wires, and the actual resistance value is annotated nearby (for example, 4.7kΩ). This combination—the recognizable two-terminal symbol plus the numeric value—lets you identify a resistor quickly in any schematic. Other symbols don’t fit because a circle with R isn’t the standard resistor symbol, a straight line with arrows indicates a variable resistor or potentiometer, and a triangle with a line is the diode symbol.

Resistors are two-terminal passive components, and their symbol is designed to be a distinct two-terminal element in schematics. In older drawings it’s shown as a zigzag line between two connection points; in many modern diagrams it’s drawn as a simple rectangular block. The key is that the symbol represents a resistance between two wires, and the actual resistance value is annotated nearby (for example, 4.7kΩ). This combination—the recognizable two-terminal symbol plus the numeric value—lets you identify a resistor quickly in any schematic. Other symbols don’t fit because a circle with R isn’t the standard resistor symbol, a straight line with arrows indicates a variable resistor or potentiometer, and a triangle with a line is the diode symbol.