Conductor

Conductor or conduction may refer to:

In science:

• Electrical conductor, a material allowing the flow of electric charge
• Electrical conduction, the movement of charged particles through an electrical conductor
• Fast ion conductor, a solid-state electrical conductor which conducts due to the movement of ions
• Conduction (heat), the transfer of thermal energy through matter
• Electrical conduction system of the heart

In music:

• Conductor, a person who leads a musical ensemble by way of visible gestures known as conducting
• Conductor (album), an album by indie rock band The Comas
• Conduction, a type of structured free improvisation in music notably practiced by Butch Morris

In other:

• Conductor (transportation), a person who sells and checks tickets on a bus, train, etc.
• Conductor (architecture), a traditional name for a downspout
• Conductor (Army), a senior Warrant Officer appointment in the Royal Logistic Corps and its predecessors
• Conductor (underground railroad), an operative of the Underground Railroad of the 19th century United States helping move slaves to freedom
• Mr. Conductor, a character in Shining Time Station and in Thomas and the Magic Railroad

In mathematics:

• Conductor (ring theory), an ideal of a ring that measures how far it is from being integrally closed
• Conductor of an abelian variety, a description of its bad reduction
• Conductor of a Dirichlet character, the natural (smallest) modulus for a character
• Conductor (class field theory), a modulus describing the ramification in an abelian extension of local or global fields
• Artin conductor, an ideal or number associated to a representation of a Galois group of a local or global field
• In the theory of numerical semigroups, the conductor of a numerical semigroup (also called the Frobenius number of the semigroup) is the greatest integer not in the semigroup.