Voltmeter

Definition

A voltmeter is an instrument used to measure the potential difference or voltage across two points in a circuit. It measures how much electrical energy is being transferred between those points.

Related terms

Electromotive Force (EMF):

EMF is the potential difference or voltage produced by a source such as a battery or generator.

Ammeter:

An ammeter is an instrument used to measure the electric current flowing through a circuit. It tells us how many charges are passing through it per unit time.

Resistance:

Resistance refers to how much opposition there is for electric current flow in a material or component of a circuit.