Which symbol represents an ohmmeter in circuit diagrams?

Which symbol represents an ohmmeter in circuit diagrams?

• A. Lamp symbol
• B. Ohmmeter symbol
• C. LED symbol
• D. Resistor symbol

Answer: (B)

In circuit diagrams, instruments are shown as circular meters to indicate measurement devices. An ohmmeter is the tool used to measure resistance, so its symbol uses the omega sign (Ω) inside a circle to reflect what it measures. That makes it clear it’s an instrument for resistance rather than a passive component. This symbol helps distinguish it from a resistor, which is drawn as a zigzag line (or a rectangle in some standards), a lamp symbol which is a circle with a filament-like mark (or cross), and an LED symbol which is a diode symbol with light-emission arrows. The presence of the Ω inside the circle immediately signals that the device is an ohmmeter.

In circuit diagrams, instruments are shown as circular meters to indicate measurement devices. An ohmmeter is the tool used to measure resistance, so its symbol uses the omega sign (Ω) inside a circle to reflect what it measures. That makes it clear it’s an instrument for resistance rather than a passive component. This symbol helps distinguish it from a resistor, which is drawn as a zigzag line (or a rectangle in some standards), a lamp symbol which is a circle with a filament-like mark (or cross), and an LED symbol which is a diode symbol with light-emission arrows. The presence of the Ω inside the circle immediately signals that the device is an ohmmeter.