(AD) Aviation Machinist Mate Week 2
Electricity - ANS-The physical phenomena arising from the existence and interaction of
an electrical charge
Voltage / Electromotive Force (EMF) - ANS-The amount of force being applied to a
circuit to produce an electron flow
Amperage / Current Flow - ANS-The quantity of electricity flowing through the circuit
Resistance - ANS-The opposition to the flow of electrons offered by a device or material
Ohms - ANS-The measurement of resistance to current flow
Watt - ANS-The measurement of electrical work done
Forms of Electricity - ANS-Static and Dynamic
Static Electricity - ANS-(1) Electricity at rest
(2) Begins with a build up of either a positive or negative electron charge. If two
negative charges or two positive charges are brought close together, the objects that
hold that charge repel each other. If a positive charge is brought within close proximity
of a negative charge, the two objects attract each other
(3) Static electricity is produced by friction and is not easily measured nor is it
controllable or usable
Dynamic Electricity - ANS-A practical form of current flow that is used in everyday life.
This form of electricity is easily produced, measured, and controlled
Methods of Producing Dynamic Electricity - ANS-Mechanical, Chemical, Thermal, and
Pressure
Mechanical - ANS-Produced by rotating a magnetic field through another magnetic field
Ex: A Grass Cutter
, Chemical - ANS-Produced by surrounding two or metallic plates with a chemical
electrolyte
Ex: A Battery
Thermal - ANS-Produced by joining two dissimilar metals and applying heat
Ex: Thermocouple
Pressure - ANS-Produced by applying pressure to quartz, which will produce an
electron flow
Ex: A Watch
Types of Electricity - ANS-AC and DC
Direct Current (DC) - ANS-Current that is a steady flow in one direction only. It is
produced mechanically by a DC generator, or chemically by a battery
Ex: A Flashlight
Alternating Current (AC) - ANS-Current flow that reverses direction at specific intervals,
defined as Hertz / Cycles. It is produced mechanically by an AC generator
Ex: A TV Screen
Electrical Test Equipment - ANS-Multimeter
Multimeter Test Leads - ANS-Red lead = Positive and Black lead = Negative
Multimeter Digital Display Features - ANS-Power Up, Overload Indication (OL), and Low
Battery Indicator
Power Up - ANS-All segments appear while the instrument performs a self-test. At the
end of the test, meter will chirp once indicating that it is ready for use
Overload Indication (OL) - ANS-Indicates input is too large to display
Low Battery Indicator - ANS-Appears when approximately 100 hours of life remain. If
left on, the meter will go to standby mode after one hour to save the battery
Electricity - ANS-The physical phenomena arising from the existence and interaction of
an electrical charge
Voltage / Electromotive Force (EMF) - ANS-The amount of force being applied to a
circuit to produce an electron flow
Amperage / Current Flow - ANS-The quantity of electricity flowing through the circuit
Resistance - ANS-The opposition to the flow of electrons offered by a device or material
Ohms - ANS-The measurement of resistance to current flow
Watt - ANS-The measurement of electrical work done
Forms of Electricity - ANS-Static and Dynamic
Static Electricity - ANS-(1) Electricity at rest
(2) Begins with a build up of either a positive or negative electron charge. If two
negative charges or two positive charges are brought close together, the objects that
hold that charge repel each other. If a positive charge is brought within close proximity
of a negative charge, the two objects attract each other
(3) Static electricity is produced by friction and is not easily measured nor is it
controllable or usable
Dynamic Electricity - ANS-A practical form of current flow that is used in everyday life.
This form of electricity is easily produced, measured, and controlled
Methods of Producing Dynamic Electricity - ANS-Mechanical, Chemical, Thermal, and
Pressure
Mechanical - ANS-Produced by rotating a magnetic field through another magnetic field
Ex: A Grass Cutter
, Chemical - ANS-Produced by surrounding two or metallic plates with a chemical
electrolyte
Ex: A Battery
Thermal - ANS-Produced by joining two dissimilar metals and applying heat
Ex: Thermocouple
Pressure - ANS-Produced by applying pressure to quartz, which will produce an
electron flow
Ex: A Watch
Types of Electricity - ANS-AC and DC
Direct Current (DC) - ANS-Current that is a steady flow in one direction only. It is
produced mechanically by a DC generator, or chemically by a battery
Ex: A Flashlight
Alternating Current (AC) - ANS-Current flow that reverses direction at specific intervals,
defined as Hertz / Cycles. It is produced mechanically by an AC generator
Ex: A TV Screen
Electrical Test Equipment - ANS-Multimeter
Multimeter Test Leads - ANS-Red lead = Positive and Black lead = Negative
Multimeter Digital Display Features - ANS-Power Up, Overload Indication (OL), and Low
Battery Indicator
Power Up - ANS-All segments appear while the instrument performs a self-test. At the
end of the test, meter will chirp once indicating that it is ready for use
Overload Indication (OL) - ANS-Indicates input is too large to display
Low Battery Indicator - ANS-Appears when approximately 100 hours of life remain. If
left on, the meter will go to standby mode after one hour to save the battery
