The combination of ammeter, voltmeter, and ohmmeter into a compact single meter with one common galvanometer is called:
Correct answer: B. AVO meter
- A. Post office box
- B. AVO meter
- C. Meter bridge
- D. Microscope
Explanation
The correct answer is the AVO meter, also known as a multimeter. It combines an ammeter, voltmeter, and ohmmeter into one device using a common galvanometer, allowing it to measure current (both AC and DC), voltage, and resistance. Other options are incorrect because a post office box is a mail-related item, a meter bridge is used for measuring resistance specifically via the Wheatstone bridge method, and a microscope is an optical device for observing small objects.
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