Semiconductors & Electromagnetic Induction – Leaving Cert Physics Terms

Leaving CertificatePhysics

Semiconductor – is a material whose resistivity is between that of a good conductor and a good insulator.

Intrinsic Conduction – is the movement of charges through a pure semiconductor.

Extrinsic Conduction – is the movement of charges through a doped semiconductor.

Doping – is the addition of a small amount of atoms of another element to a pure semiconductor to increase its conductivity.

n-type semiconductor – is a semiconductor in which electrons are the majority charge carriers.

p-type semiconductor – is a semiconductor in which holes are the majority charge carriers.

Ampere – is that current which, if flowing in two, infinitely long parallel wires, of negligible cross-sectional area, one metre apart, in a vacuum, experiences a force of 2 x 10-7 N per metre.

Electromagnetic Induction – When a conductor cuts a magnetic flux an emf is induced.

Faraday’s Law – states that the size of the induced emf is proportional to the rate of change of flux.

Lenz’s Law – states that the direction of the induced emf is always such as to oppose the change producing it.

Magnetic Flux – is the product of Flux Density by Area.

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