Which measuring instrument can be used to measure current, voltage, and resistance?

• A. Multimeter
• B. Frequency meter
• C. Ohmeter
• D. Vernier caliper

Answer: (A)

A multimeter is a versatile measuring instrument capable of measuring current, voltage, and resistance. It typically features different settings or modes allowing the user to select the specific measurement they wish to take. For example, in the current mode, it can measure both alternating current (AC) and direct current (DC). In voltage mode, it can measure both AC and DC voltage levels. When switched to resistance mode, it can measure the resistance of a component or circuit, displaying the results in ohms.

This multifunctional capability makes the multimeter an essential tool for electrical mechanics, as it can perform multiple measurements without the need for several different devices. Other options, such as the frequency meter, are specialized tools designed solely for measuring frequency, while the ohmmeter is limited to measuring resistance. The vernier caliper is a precision tool used for measuring dimensions, not electrical parameters.