Electrical Circuit Symbols for Measuring Devices

Steps:

• Recall standard symbols in circuit diagrams for measurement tools.
• Identify the ammeter as the device that measures electric current in amperes.
• Match the symbol: a circle with "A" inside represents the ammeter.
• Eliminate other symbols that represent voltage, resistance, or unrelated components.

Why A is correct:

• The ammeter symbol is a circle containing "A", directly defined in electrical engineering standards (e.g., IEC 60617) as the indicator for current measurement.

Why the others are wrong:

• B represents a voltmeter, which measures voltage, not current.
• C represents an ohmmeter, which measures resistance.
• D represents a galvanometer or unrelated component, not specifically for current.

Final answer: A

[VIOLATION]