- magnet
Body that can be used to attract or repel magnetic materials.
- magnetic circuit breaker
- Circuit breaker that is tripped or activated by use of an
electromagnet.
- magnetic coil
- Spiral of a conductor which is called an electromagnet.
- magnetic core
- Material that exists in the center of the mahnetic coil to
either physically support the windings (non-magnetic material) or to
concentrate the magnetic flux (magnetic material).
- magnetic field
- Magnetic lines of force travelling from the north pole to the
south pole of a magnet.
- magnetic flux
- The magnetic lines of force produced by a magnet.
- magnetic leakage
- The passage of magnetic flux outside the path along which it
can do useful work.
- magnetic poles
- Points of a magnet from which magnetic lines of force leave
(north pole) and arrive (south pole).
- magnetism
- Property of some materials to attract or repel others.
- magnetizing force
- Also called magnetic field strength. It is the magnetomotive
force per unit length at any given point in a magnetic circuit.
- magnetomotive force
- Force that produces a magnetic field.
- majority carriers
- The conduction band electrons in an n-type material and the
valence band holes in a p-type material. Produced by pentavalent
impurities in n-type material and trivalent impurities in p-type
material.
- matched impedance
- Condition that occurs when the output impedance of a souce is
equal to the input impedance of a load.
- matching
- Connection of two components or circuits so that maximum
power is transferred between the two.
- maximum power transfer
- A theorem that states that maximum power will be transferred
from source to load when input impedance of the load equals the output
impedance of the source.
- Maxwell
- Unit of magnetic flux. One maxwell equals one magnetic line
of force.
- mercury cell
- Primary cell using a mercuric oxide cathode, a zinc anode and
a potassium hydroxide electrolyte.
- metal film resistor
- A resistor in which a film of metal oxide or alloy is
deposited on an insulating substrate.
- metal oxide field effect transistor
- (MOSFET) A field effect transistor in which the insulating
layer betwen the gate electrode and the channel is a metal oxide layer.
- metal oxide resistor
- A metal film resistor in which an oxide of metal (such as
tin) is deposited as a film onto the substrate.
- meter
- Any electrical or electronic measuring device. In the metric
system, it is the unit of length equal to 39.37 inches.
- meter FSD current
- Value of meter current needed to cause the needle to deflect
to its maximum position (full scale deflection).
- meter resistance
- DC resistance of the meter's armature coil.
- mica capacitor
- Capacitor using mica as the dialectric.
- microphone
- Electroacoustic transducer that converts sound energy into
elecric energy.
- microwave
- Band of very short wavelength radio waves within the UHF, SHF
and EHF bands.
- midband gain
- Gain of an amplifier operating within its bandwidth.
- mid-point bias
- An amplifier biased at the center of its DC load line.
- mil
- One thousandth of an inch (0.001 in.)
- Miller's theorem
- A theorem that allows you to represent a feedback capacitor
as equivalent input and output shunt capacitors.
- minority carriers
- The conduction band holes in n-type material and valence band
electrons in p-type material. Most minority carriers are produced by
temperature rather than by doping with impurities.
- mismatch
- Term used to describe a difference between the output
impedance of a source and the input impedance of a load. A mismatch
prevents the maximum transfer of power from source to load.
- modulation
- Process by which an information signal (audio for example) is
used to modify some characteristic of a higher frequency wave known as a
carrier (radio for example).
- monostable multivibrator
- A nultivibrator with one stable output state. When triggered,
the circuit output will switch to the unstable state for a predetermined
period of time and then return to the stable state. A timer.
- molecule
- Smallest particle of a compound that still retains its
characteristics.
- MOSFET
- Abbreviation for "metal oxide field effect transistor" also
known as an "insulated gate field effect transistor). A field effect
transistor in which the insulating layer betwen the gate electrode and
the channel is a metal oxide layer.
- moving coil microphone
- Microphone that uses a moving coil within a fixed magnetic
field. Dynamic microphone.
- moving coil pick-up
- Dynamic phonograph pick-up in which the stylus causes a coil
to move within a fixed magnetic field.
- moving coil loudspeaker
- Loudspeaker that uses a moving "voice coil" placed within a
fixed magnetic field. Audio frequency current in the voice coil causes
movement which is mechanically transferred to the speaker cone. Also
known as a dynamic loudspeaker.
- multimeter
- Electronic test equipment that can perform multiple tasks.
Typically one capable of measuring voltage, current and resistance. More
sophisticated modern digital multimeters also measure capacitance,
inductance, current gain of transistors and/or anything else that can be
measured electronically.
- multiplier resistor
- Resistor connected in series with a moving coil meter
movement to extend the voltage ranges.
- multisegmant display
- Device made of several light emitting diodes arranged in a
numeric or alphanumeric pattern. By lighting selected segments numeric
or alphabet characters can be displayed.
- multivibrator
- A class of circuits designed to produce square waves or
pulses. Astable multivibrators produce continous pulses without an
external stimulus or trigger. Monostable multivibrators produce a single
pulse for some predetermind period of time only when triggered. Bistable
multivibrators produce a DC output which is stable in either one of two
states. Either high or low. An external stimulus or trigger is required
for the bistable circuit to change states, either high to low or low to
high.
- mutual inductance
- Ability of one inductor's lines of force to link with another
inductor.
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