|alternating current (ac) — electric current in which electrons repeatedly change direction.
amperage — the number of electrons that pass a given point at a given time.
ampere, amp — a unit of electric current used to measure the rate of flow.
battery — a device that uses chemicals to generate and store electricity.
capacitor — an electric circuit element used to store charge temporarily.
circuit — a path of conductors that an electric current follows.
conductor — a material through which electric current flows easily.
current electricity — electricity that flows through a circuit, or a continuous unbroken path.
direct current (dc) — electric current that flows in one direction only.
electricity — a form of energy produced by the flow or accumulation of electrons.
electromagnet — a temporary magnet formed when electric current flows through a wire or other conductor.
electron — a subatomic particle with a negative electrical change.
fluorescence — a process by which substances give off light or another form of electromagnetic radiation when they absorb energy.
incandescence — the effect by which an object begins to glow when heated.
insulator — a material that opposes the flow of electric current.
ion — an atom or group of atoms that has either gained or lost electrons and so has an electrical change.
ohm — unit of electrical resistance used to measure a material's resistance to the flow of electric current.
Ohm's law — a law stating that the direct current flowing in a conductor is directly proportional to the potential difference between its ends. It is usually formulated as V = IR, where V is the potential difference, or voltage, I is the current, and R is the resistance of the conductor.
parallel circuit — a circuit that splits into branches. A break in one branch will not stop current in the other branches.
resistance — the degree to which a substance resists electric current.
resistor — a device used to control current by providing resistance.
series circuit — a circuit that connects a source, load, and conductors in a single loop. Any break in the circuit will stop the flow of current.
static electricity — the build up of electrical charges on a surface produced by the contact and separation of dissimilar materials.
superconductors — materials that lose all resistance to the flow of current at low temperatures. They operate extremely fast and produce almost no heat.
transfer — the movement of electrons from one place to another either by current of static.
transformation — the change in energy from one type to another as in a battery, which changes chemical energy to electricity.
volt — unit of potential difference (similar to pressure).
voltage — a type of "pressure" that drives electrical charges through a circuit.
watt — unit of power equal to volts x amps.