Name the device that helps you to maintain potential difference across a conductor

battery

Explanation:

Any source of electricity, the battery, or the power supply is there to maintain the potential difference across a conductor.

To measure this difference we use VOLTMETER - Instrument for measuring potential differences, voltage differences. It is called a voltmeter as it allows the measurement of the potential difference or voltage that exists between two points belonging to an electrical circuit. The voltmeter, therefore, detects the voltage.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.