ENGINEERING ELECTROMAGNETICS
CERTIFICATION EVALUATION EXAMS SET
FULL QUESTIONS AND COMPLETE
SOLUTION
●● Current
Answer: a steady flow of electrons. When electrons move from one
place to another, round a circuit, they carry electrical energy from place
to place like marching ants carrying leaves. Instead of carrying leaves,
electrons carry a tiny amount of electric charge.
●● Circuit theory (laws)
Answer: Physics Concept. Kirchhoff's laws are fundamental to circuit
theory. They quantify how current flows through a circuit and how
voltage varies around a loop in a circuit. Kirchhoff's current law (1st
Law) states that current flowing into a node (or a junction) must be equal
to current flowing out of it.
●● Alternating Current (AC)
Answer: An electric current that reverses its direction many times a
second at regular intervals.
●● Ammeter
,Answer: An instrument for measuring the flow of electrical current in
amperes. Ammeters are always connected in series with the circuit to be
tested.
●● Ampacity
Answer: The maximum amount of electric current a conductor or device
can carry before sustaining immediate or progressive deterioration.
●● Ampere-Hour (Ah)
Answer: A unit of measure for battery capacity. It is obtained by
multiplying the current (in amperes) by the time (in hours) during which
current flows. For example, a battery which provides 5 amperes for 20
hours is said to deliver 100 ampere - hours.
●● Ampere (A)
Answer: A unit of measure for the intensity of an electric current flowing
in a circuit. One ampere is equal to a current flow of one coulomb per
second.
●● Apparent Power.
Answer: Measured in volt-ampers (VA). Apparent power is the product
of the rms voltage and the rms current.
●● Armature
, Answer: The movable part of a generator or motor. It is made up of
conductors which rotate through a magnetic field to provide voltage or
force by electromagnetic induction. The pivoted points in generator
regulators are also called armatures.
●● Capacitance
Answer: The ability of a body to store an electrical charge. Measured in
farads as the ratio of the electric charge of the object (Q, measured in
coulombs) to the voltage across the object (V, measured in volts).
●● Capacitor
Answer: A device used to store an electric charge, consisting of one or
more pairs of conductors separated by an insulator. Commonly used for
filtering out voltage spikes.
●● Circuit
Answer: A closed path in which electrons from a voltage or current
source flow. Circuits can be in series, parallel, or in any combination of
the two.
●● Circuit Breaker
Answer: An automatic device for stopping the flow of current in an
electric circuit. To restore service, the circuit breaker must be reset
(closed) after correcting the cause of the overload or failure. Circuit
breakers are used in conjunction with protective relays to protect circuits
from faults.
CERTIFICATION EVALUATION EXAMS SET
FULL QUESTIONS AND COMPLETE
SOLUTION
●● Current
Answer: a steady flow of electrons. When electrons move from one
place to another, round a circuit, they carry electrical energy from place
to place like marching ants carrying leaves. Instead of carrying leaves,
electrons carry a tiny amount of electric charge.
●● Circuit theory (laws)
Answer: Physics Concept. Kirchhoff's laws are fundamental to circuit
theory. They quantify how current flows through a circuit and how
voltage varies around a loop in a circuit. Kirchhoff's current law (1st
Law) states that current flowing into a node (or a junction) must be equal
to current flowing out of it.
●● Alternating Current (AC)
Answer: An electric current that reverses its direction many times a
second at regular intervals.
●● Ammeter
,Answer: An instrument for measuring the flow of electrical current in
amperes. Ammeters are always connected in series with the circuit to be
tested.
●● Ampacity
Answer: The maximum amount of electric current a conductor or device
can carry before sustaining immediate or progressive deterioration.
●● Ampere-Hour (Ah)
Answer: A unit of measure for battery capacity. It is obtained by
multiplying the current (in amperes) by the time (in hours) during which
current flows. For example, a battery which provides 5 amperes for 20
hours is said to deliver 100 ampere - hours.
●● Ampere (A)
Answer: A unit of measure for the intensity of an electric current flowing
in a circuit. One ampere is equal to a current flow of one coulomb per
second.
●● Apparent Power.
Answer: Measured in volt-ampers (VA). Apparent power is the product
of the rms voltage and the rms current.
●● Armature
, Answer: The movable part of a generator or motor. It is made up of
conductors which rotate through a magnetic field to provide voltage or
force by electromagnetic induction. The pivoted points in generator
regulators are also called armatures.
●● Capacitance
Answer: The ability of a body to store an electrical charge. Measured in
farads as the ratio of the electric charge of the object (Q, measured in
coulombs) to the voltage across the object (V, measured in volts).
●● Capacitor
Answer: A device used to store an electric charge, consisting of one or
more pairs of conductors separated by an insulator. Commonly used for
filtering out voltage spikes.
●● Circuit
Answer: A closed path in which electrons from a voltage or current
source flow. Circuits can be in series, parallel, or in any combination of
the two.
●● Circuit Breaker
Answer: An automatic device for stopping the flow of current in an
electric circuit. To restore service, the circuit breaker must be reset
(closed) after correcting the cause of the overload or failure. Circuit
breakers are used in conjunction with protective relays to protect circuits
from faults.
