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A solid substance that has a conductivity between that of an insulator and that of most metals, either due to the addition of an impurity or because of temperature effects.

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A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

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A piece of iron (or an ore, alloy, or other material) that has its component atoms so ordered that the material exhibits properties of magnetism, such as attracting other iron-containing objects or aligning itself in an external magnetic field.

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A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.

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A goup of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

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An electron of an atom, located in the outermost shell of the atom, that can be transferred to or shared with another atom.

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A stationary electric charge, typically produced by friction, which causes sparks or crackling or the attraction of dust or hair.

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The opposition that a substance offers to the flow of electric current.

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The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.

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An instrument designed to measure electric current, voltage, and usually resistance, typically over several ranges of value.

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Physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.

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The SI unit of electric charge, equal to the quantity of electricity conveyed in one second by a current of one ampere.

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A light-emitting diode (a semiconductor diode which glows when a voltage is applied).

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A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

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A substance which does not readily allow the passage of heat or sound.

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A person or thing that generates something.

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An electromotive force or potential difference expressed in volts.

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A part or aspect of something abstract, especially one that is essential or characteristic.

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Field magnet refers to a magnet used to produce a magnetic field in a device.

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Used to explain the behavior of electricity, states that electric current consists of electron flow and can be defined as a moving charge.

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An electric current flowing in one direction only.

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The unbroken and consistent existence or operation of something over a period of time.

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The rotating coil or coils of a dynamo or electric motor.

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The positively charged electrode by which the electrons leave a device.

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A machine, especially one powered by electricity or internal combustion, that supplies motive power for a vehicle or for some other device with moving parts.

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A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.

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A person who directs the performance of an orchestra or choir.

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A roughly circular line, route, or movement that starts and finishes at the same place.

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The negatively charged electrode by which electrons enter an electrical device.

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A container consisting of one or more cells, in which chemical energy is converted into electricity and used as a source of power.

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The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

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An electric current is a flow of electric charge. In electric circuits this charge is often carried by electrons moving through a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in an ionized gas.

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A soft metal core made into a magnet by the passage of electric current through a coil surrounding it.

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The basic unit of a chemical element.

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An attachment, connected to the armature of a motor or generator, through which electrical connection is made and which ensures that the current flows as direct current.

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A unit of electric current equal to a flow of one coulomb per second.