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From the expression for the torque on a current loop, the characteristics of the current loop are summarized in its magnetic moment
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.
Short summary of the properties of series and parallel suitable for UK GCSE level.
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.
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.
Microphones are transducers which detect sound signals and produce an electrical image of the sound
How do headphones turn an electrical signal into sound. Find out how and have a look inside an earphone.
Good revision site aimed at UK A Level standard covering resistance, ohm's law, conductivity etc
Definition and links to related information on electrical resistance.
A complete reference about electrical resistors. This site contains information and facts about resistors, varistors, potentiometers, thermistors and more
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