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hyperphysics

Magnetic Dipole Moment

From the expression for the torque on a current loop, the characteristics of the current loop are summarized in its magnetic moment

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Induction motor action

Induction motors use shorted wire loops on a rotating armature and obtain their torque from currents induced in these loops by the changing magnetic field produced in the field coils.

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Types of Electrical Circuits

Short summary of the properties of series and parallel suitable for UK GCSE level.

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Doping Of Semiconductors

The addition of a small percentage of foreign atoms in the regular crystal lattice of silicon or germanium produces dramatic changes in their electrical properties.

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Microphone

Microphones are transducers which detect sound signals and produce an electrical image of the sound

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How headphones work

How do headphones turn an electrical signal into sound. Find out how and have a look inside an earphone.

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Electrical resistance

Good revision site aimed at UK A Level standard covering resistance, ohm's law, conductivity etc

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Resistance

Definition and links to related information on electrical resistance.

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hyperphysics

Biot-Savart Law

The Biot-Savart Law relates magnetic fields to the currents which are their sources. In a similar manner, Coulomb's law relates electric fields to the point charges which are their sources.

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Articles on electricity

A thorough and passionate clarification of the many misconceptions in electrical study which arise at school. Ideal for non-specialist staff who are not too sure what "electricity" actually is.

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