Final answer:
A voltmeter indicates electrical output and charging system condition by measuring the potential difference between two points in an electrical circuit. For instance, in vehicles, voltmeters can indicate fuel levels and engine temperature based on the voltage output from sender units.
Step-by-step explanation:
The voltmeter simply shows the voltage, which is an indicator of electrical output and charging system condition. A voltmeter is used to measure the potential difference between two points in an electrical circuit. For example, in a 1996 Volkswagen, the fuel and temperature gauges are voltmeters that register the voltage output of 'sender' units which reflect the amount of gasoline in the tank and the engine's temperature respectively.
Voltmeters measure voltage, whereas ammeters measure current. These devices are important for ensuring that electrical systems in automobiles and other electronics, like digital cameras and cell phones, are functioning correctly. Understanding how voltmeters are connected to the system they monitor can provide insight into the applications of series and parallel connections in electrical circuits, ensuring that these devices do not significantly alter the circuits they are measuring.