Voltage drop is the reduction in voltage that occurs when current flows through a conductor. It is important to check voltage drop in order to ensure that electrical equipment is receiving the correct amount of power. Excessive voltage drop can cause equipment to malfunction or even fail.
There are a number of ways to check voltage drop. One common method is to use a voltmeter. A voltmeter is a device that measures the difference in electrical potential between two points. To check voltage drop, the voltmeter is connected across the conductor in question. The voltmeter will then display the amount of voltage drop that is occurring.