NCATT FROM WEBSITE EXAM
2025 QUESTIONS AND ANSWERS
Ampere (A, amp, amperage) - ✔✔Unit of measurement used to express the flow of
electrons (electrical current). One ampere is a rate of flow of one coulomb (6.28 billion -
billion electrons) passing a given point in an electrical circuit per second. In
mathematical problems amperage is expressed by the letter "I".
Battery - ✔✔A device consisting of a number of primary voltaic cells (cells that cannot
be recharged) or secondary cells (cells that can be recharged) connected in series to
obtain a desired DC voltage. A battery stores chemical energy and makes the energy
available in the electrical form. Aircraft storage batteries are generally rated at 12 or 24
volts.
Capacitor - ✔✔Electrical component used to store electrical energy in the form of an
electrostatic field.
A capacitor is a device made of two parallel conductors separated by an insulator.
Conductor - ✔✔Common building block of electrical circuits that easily permits the
movement of electrons from an electrical source to a load and back to the electrical
source with a minimum of resistance.
A conductor's resistance depends on such factors as cross sectional area, length,
temperature, and conductor material.
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 1
, Coulomb - ✔✔Basic unit of electrical quantity.
A coulomb is equal to 6.28 billion - billion electrons (6.28 X 10 to the 18th).
Current - ✔✔The flow of electrons through a conductor is known as current flow.
The rate of current flow is measured in amperes.
Direct Current - ✔✔Flow of electrons in one direction throughout a circuit with
constant voltage and current.
Direct current is caused by a constant difference of potential, both negative and
positive.
Electron - ✔✔Negatively charged subatomic particles that are located and travel around
(orbit) the nucleus in an imaginary sphere or shell at the speed of light (186,000
miles/second).
Electrons are involved in the conduction of electricity.
E.M.F - ✔✔The force that causes electrons to flow through a conductor
This force is abbreviated e.m.f..
The unit of measurement for electromotive force is the volt.
In mathematical problems voltage is expressed by the letter "E".
Farad - ✔✔Basic unit of capacitance.
One farad holds one coulomb under a pressure of one volt.
Henry (H) - ✔✔Basic unit of measurement for inductance of an electrical coil.
One (1) henry is the inductance of a coil when a change of current of one (1) ampere per
second induces an e.m.f. of one (1) volt.
In mathematical problems inductance is expressed by the symbol "L".
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 2
2025 QUESTIONS AND ANSWERS
Ampere (A, amp, amperage) - ✔✔Unit of measurement used to express the flow of
electrons (electrical current). One ampere is a rate of flow of one coulomb (6.28 billion -
billion electrons) passing a given point in an electrical circuit per second. In
mathematical problems amperage is expressed by the letter "I".
Battery - ✔✔A device consisting of a number of primary voltaic cells (cells that cannot
be recharged) or secondary cells (cells that can be recharged) connected in series to
obtain a desired DC voltage. A battery stores chemical energy and makes the energy
available in the electrical form. Aircraft storage batteries are generally rated at 12 or 24
volts.
Capacitor - ✔✔Electrical component used to store electrical energy in the form of an
electrostatic field.
A capacitor is a device made of two parallel conductors separated by an insulator.
Conductor - ✔✔Common building block of electrical circuits that easily permits the
movement of electrons from an electrical source to a load and back to the electrical
source with a minimum of resistance.
A conductor's resistance depends on such factors as cross sectional area, length,
temperature, and conductor material.
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 1
, Coulomb - ✔✔Basic unit of electrical quantity.
A coulomb is equal to 6.28 billion - billion electrons (6.28 X 10 to the 18th).
Current - ✔✔The flow of electrons through a conductor is known as current flow.
The rate of current flow is measured in amperes.
Direct Current - ✔✔Flow of electrons in one direction throughout a circuit with
constant voltage and current.
Direct current is caused by a constant difference of potential, both negative and
positive.
Electron - ✔✔Negatively charged subatomic particles that are located and travel around
(orbit) the nucleus in an imaginary sphere or shell at the speed of light (186,000
miles/second).
Electrons are involved in the conduction of electricity.
E.M.F - ✔✔The force that causes electrons to flow through a conductor
This force is abbreviated e.m.f..
The unit of measurement for electromotive force is the volt.
In mathematical problems voltage is expressed by the letter "E".
Farad - ✔✔Basic unit of capacitance.
One farad holds one coulomb under a pressure of one volt.
Henry (H) - ✔✔Basic unit of measurement for inductance of an electrical coil.
One (1) henry is the inductance of a coil when a change of current of one (1) ampere per
second induces an e.m.f. of one (1) volt.
In mathematical problems inductance is expressed by the symbol "L".
COPYRIGHT © 2025 BY OLIVIA WEST, ALL RIGHTS RESERVED 2
