The current flow between the anode and cathode in a galvanic couple is measured using which device?

• A. Ammeter
• B. Voltmeter
• C. Ohmmeter
• D. Multimeter

Answer: (A)

Current flow between the anode and cathode in a galvanic couple is the rate at which electrons move through the external circuit. To measure how much current is flowing, you insert an ammeter in series with the circuit. An ammeter is built to have very low resistance so it doesn’t noticeably affect the current it’s measuring, and it gives you the current in amperes.

A voltmeter, by contrast, is used to measure voltage (the potential difference) and is connected in parallel across points in the circuit, not in series. An ohmmeter measures resistance, and a multimeter can measure several quantities but, when you’re specifically after the current in the galvanic couple, the dedicated current-measuring device—the ammeter—is the best choice.