Question

Name a device that helps to maintain a potential difference across a conductor.

Answer 1

Hint Potential difference can be well-defined as the difference in the amount of energy that charge carriers have in the middle of two points in a circuit. The potential difference is measured in volts and is also recognized as voltage.

Complete Step-by-step solution
A battery contains a group of cells to produce a potential difference. A cell is a solo unit that makes a battery. A group of cells makes a battery.
Both batteries as well as a cell help to keep a potential difference across a conductor. This makes the current flow. They are used as a portable source of power in almost all electric devices like flashlight, mobile phones, and electric cars.

Additional Information
 An electrochemical cell is a device expert of either making electrical energy from chemical reactions or using electrical energy to cause chemical reactions. A battery is a device containing one or more electrochemical cells with external connections for running electrical devices.
 A battery is a group of chemical cells having a cathode and an anode, which generates the flow of electrons in a circuit. Batteries are a compact source of energy. Energy storage is a major problem all over the world and batteries solve this problem by reducing storage capacity very less and eliminating the need to carry fuel.

Note When a wire is connected to the two terminals of a cell, the current flows from the positive to the negative terminal of a cell. On the other hand, if just two wires are connected to the terminals without making a closed loop, then there will not be any current flow because a complete closed loop would only constitute a current flow.