Question

The device which maintains a constant potential difference between its ends is called

• A. battery
• B. multimeter
• C. ammeter
• D. electric bulb

Answer 1

The Correct Option is A

• Battery: A battery is designed to maintain a constant potential difference across its terminals by converting chemical energy into electrical energy. Thus, it consistently provides voltage.
• Multimeter: This device measures electrical properties like voltage, current, and resistance. It does not maintain a potential difference.
• Ammeter: An ammeter measures current in a circuit; it doesn't maintain a potential difference.
• Electric Bulb: This device converts electrical energy into light and does not maintain a potential difference.

Therefore, the correct choice is a Battery because it consistently maintains a potential difference across its terminals.

Answer 2

The device that is used to maintain a constant potential difference across a circuit is a: Battery. A battery supplies a constant voltage (potential difference), which drives electric current through a circuit.

• Multimeter is used to measure voltage, current, or resistance.
• Ammeter is used to measure current.
• Electric bulb uses electric energy but does not maintain potential difference.

Final Answer: battery