A voltmeter is an instrument used to measure the voltage between two points in an electrical circuit. Some voltmeters register direct current while others measure alternating current.Continue Reading
There are two basic types of voltmeters: analog and digital, with digital being the more accurate of the two. An analog voltmeter is built with a galvanometer in series with a high resistance and the inter resistance of the voltmeter must be high. A digital voltmeter shows the voltage as numbers.
Voltmeters are used in a variety of different industries. They are common in laboratories and the automotive industry, and home electricians use them every day.Learn more about Electricity
Voltage is the difference of electrical potential between two points or two objects. Without this difference of electrical potential, electricity could not be used as a power source.Full Answer >
Ohm's law describes the relationship between current, resistance, and voltage between two points. The law states that V=I*R, where V is voltage, I is current, and R is resistance. Current is measured in amperes, voltage is measured in volts, and resistance is measured in ohms.Full Answer >
A DC voltmeter measures the current passing between two points. The normal use of a voltmeter is to check the power in an electrical circuit. Manufacturers install some voltmeters permanently in equipment, but in testing equipment, the voltmeter is generally portable, allowing the user to test different circuits.Full Answer >
Kirchhoff's loop rule states that the sum of the potential drops around a closed loop in a circuit is equal to the voltage supplied to the loop. This rule arises from conservation of energy, which states that energy cannot be created nor destroyed but is instead transferred. Voltage sources, such as a battery or a capacitor, supply the energy, and components such as resistors create the potential drops.Full Answer >