Moodle Activity Examples

A method of cw keying using punched tape or other mechanical means to key a
transmitter [12].

See BALANCED MIXER [18].

A combination of H-type and E-type T-junctions [11].

Wire coated with an enamel insulation and used in coils, relays, transformers, motor windings, and so forth [4].

An electromagnetic device that uses one or more saturable reactors to obtain
a large power gain. This device is used in servosystems requiring large amounts of power to move heavy loads [8] [15].

(1) The region in which the magnetic forces created by a permanent magnet or by a current-carrying conductor or coil can be detected [1] [2]. (2) The field that is produced when current flows through a conductor or antenna [10] [11].

Generating a voltage in a circuit by the creation of relative motion between a
magnetic field and the circuit. The relative motion can be the result of physical movement or the rise and fall of a magnetic field created by a changing current [5].

Imaginary lines used for convenience to designate the direction in which magnetic forces are acting as a result of magnetomotive force [2].

A microphone in which the sound waves vibrate a moving armature. The
armature consists of a coil wound on the armature and located between the pole pieces of a permanent magnet. The armature is mechanically linked to the diaphragm [12].

The section of a magnet where the flux lines are concentrated; also where they
enter and leave the magnet [1].