Electric current is defined as the rate at which charge flows through a surface (the cross section of a wire, for example). Despite referring to many different things, the word current is often used by itself …

Summary Electric current is the rate at which charge flows through a surface. Electric current is often just called current. As a scalar, current has magnitude only. The symbol for current is I (italic) from …

The flow of charge is called current. It is defined as the rate at which charge is transferred through an object (I = ∆q/∆t). The unit of current is the ampere.

That is, what changes as electric current flows through a circuit? What is the source of the electrons when an electric current flows through a circuit? A typical Van de Graaff generator or Wimshurst …

Electric charges are surrounded by an electric field. Moving electric charges are also surrounded by a magnetic field. Electric current flowing through a coil of wire is an electromagnet. The spin of the …

Current in a circuit is directly proportional to the voltage applied and inversely proportional to the resistance of the circuit. This is known as Ohm's law.

Current in a circuit is directly proportional to the voltage applied and inversely proportional to the resistance of the circuit. This is known as Ohm's law.

The mathematical rules for working with multiple resistors in series and parallel combinations are explained here.

An electric current that frequently reverses direction is called an alternating current (AC). Once again, whether the intensity of the current remains constant is irrelevant.

The Physics Hypertextbook is a reaction to three big problems with textbooks: lack of writer's voice, layouts that reduce readability, and outdated economics.