Electrical Mechanic/Test Technician
1. Voltage an electromotive force or potential ditterence expressed
in volts. Potential to do work.
2. Direct Current (DC) Electric current that flows in only one direction
3. Alternating Current (AC) A flow of electric charge that regularly reverses its direc-
tion. Bidirectional.
4. Wattage the electrical power consumed by a device.
5. Coulomb the SI unit of electric charge, equal to the quantity of
electricity conveyed in one second by a current of one
ampere.
6. 1 amp = 1 coulomb/sec 1 amp = 6.25 x 10 (18)
7. Ohm unit of electrical resistance
8. Ampere (amp) Unit that measures the strength of an electric current.
9. Ammeter a device used to measure current in amperes.
10. Voltmeter a device used to measure electrical potential or voltage.
11. Wattmeter Measures electric power in watts
12. Megger An instrument used for checking the insulation resis-
tance on motors, feeders, bus bar systems, grounds,
and branch circuit wiring. Read in millions of ohms.
13. Oscilloscope a device used to display the shape of an electrical wave.
14. Multimeter A measuring instrument for current, voltage, and resis-
tance.
, Electrical Mechanic/Test Technician
15. Frequency meter Used to measure the frequency of an AC signal.
16. micrometer A gauge which measures small distances or thicknesses.
17. vernier caliper instrument used for measuring precise linear dimen-
sions
18. Wire gauge A standard measure of the diameter or thickness of a
strand of wire
19. Ohmeter a device used to measure resistance
20. Architect's Scale A specialized ruler used in making or measuring re-
duced scale drawings. It is marked with a range of cal-
ibrated ratios used for laying out distances, with scales
indicating feet, inches, and fractions of inches. Used on
drawings other than site plans.
21. Planimeter Engineering tool designed to measure distance as its
pointer is traced around a pattern.
22. Of the following electrical devices, C. Transformer
the one that is NOT normally used Transformers do not use direct current (DC). Transform-
in direct current electrical circuits ers work on alternating current (AC), which is electrical
is a .... current that flows in a single direction. A transformer's
A. Circuit breaker principle is based on electromagnetic induction, which
B. Double-pole switch requires a voltage source that changes with time. A DC
C. Transformer supply is unidirectional, so the transformer cannot work.
D. Inverter If the input terminals of a transformer are connected to
a DC voltage, the transformer usually burns.
23. Of the following motors, the one C. Squirrel cage induction. Cheap and easy to install -
that does NOT have brushes is the squirrel cage induction motors do not contain brushes,
motor. slip rings, commutators, permanent magnets, position
, Electrical Mechanic/Test Technician
A. DC shunt sensors, or other components that increase their overall
B. DC series cost. Their simple construction ensures they are gener-
C. Squirrel cage induction ally easy to install and maintain.
D. Compound
24. Of the following materials, the D. Nichrome. Most heating elements use Nichrome
one that is COMMONLY used as 80/20, which is 80% nickel and 20% chromium.
an electric heating element in an Nichrome is ideal because it has high resistance and
electric heater is... forms a chromium oxide layer when heated for the first
A. Zinc time.
B. Brass
C. Terne plate
D. Nichrome
25. A bolt is specified as 1/4-28 means Bolt is 1/4 inch in diameter and has 28 threads per inch
the...
26. Name 3 basic components of the Proton, neutron, electron
atom:
27. Two opposing forces hold the Centrifugal force & electrical attraction
electron in place. They are
force and attraction.
28. electromotive force (emf) Electrons can be moved from one atom to another by
applying some form of or pressure.
29. Amperage (amps) The measurement of the amount of electricity flowing
past a given point in a conductor per second (i.e., cur-
rent).
30. Voltage an electromotive force or potential ditterence expressed
in volts.
, Electrical Mechanic/Test Technician
31. Resistance to the flow of electrons Ohms (Ω)
is measured in .
32. The difference in voltage between Electrical
two points is called poten-
tial.
33. Alternating current will produce a Sine
wave.
34. Hertz (Hz) Unit of measurement for frequency (cycles per second).
Only for AC.
35. To measure the insulation of a Ohmmeter
rubber-covered electrical cable,
the instrument to use should be....
36. Load The work required to be done. Observed as an amper-
age draw in an electric circuit.
37. voltage drop The ditterence in an electrical potential between two
points.
38. Short circuit A connection that allows current to take an unintended
path.
39. True statement Whenever current flows through resistance, heat is pro-
duced.
40. What is an ampere? A measure of current.
Equals one coulomb passing a given point in one sec-
ond. A measure of electricity flowing through a circuit.
41. Ohm's law equation
1. Voltage an electromotive force or potential ditterence expressed
in volts. Potential to do work.
2. Direct Current (DC) Electric current that flows in only one direction
3. Alternating Current (AC) A flow of electric charge that regularly reverses its direc-
tion. Bidirectional.
4. Wattage the electrical power consumed by a device.
5. Coulomb the SI unit of electric charge, equal to the quantity of
electricity conveyed in one second by a current of one
ampere.
6. 1 amp = 1 coulomb/sec 1 amp = 6.25 x 10 (18)
7. Ohm unit of electrical resistance
8. Ampere (amp) Unit that measures the strength of an electric current.
9. Ammeter a device used to measure current in amperes.
10. Voltmeter a device used to measure electrical potential or voltage.
11. Wattmeter Measures electric power in watts
12. Megger An instrument used for checking the insulation resis-
tance on motors, feeders, bus bar systems, grounds,
and branch circuit wiring. Read in millions of ohms.
13. Oscilloscope a device used to display the shape of an electrical wave.
14. Multimeter A measuring instrument for current, voltage, and resis-
tance.
, Electrical Mechanic/Test Technician
15. Frequency meter Used to measure the frequency of an AC signal.
16. micrometer A gauge which measures small distances or thicknesses.
17. vernier caliper instrument used for measuring precise linear dimen-
sions
18. Wire gauge A standard measure of the diameter or thickness of a
strand of wire
19. Ohmeter a device used to measure resistance
20. Architect's Scale A specialized ruler used in making or measuring re-
duced scale drawings. It is marked with a range of cal-
ibrated ratios used for laying out distances, with scales
indicating feet, inches, and fractions of inches. Used on
drawings other than site plans.
21. Planimeter Engineering tool designed to measure distance as its
pointer is traced around a pattern.
22. Of the following electrical devices, C. Transformer
the one that is NOT normally used Transformers do not use direct current (DC). Transform-
in direct current electrical circuits ers work on alternating current (AC), which is electrical
is a .... current that flows in a single direction. A transformer's
A. Circuit breaker principle is based on electromagnetic induction, which
B. Double-pole switch requires a voltage source that changes with time. A DC
C. Transformer supply is unidirectional, so the transformer cannot work.
D. Inverter If the input terminals of a transformer are connected to
a DC voltage, the transformer usually burns.
23. Of the following motors, the one C. Squirrel cage induction. Cheap and easy to install -
that does NOT have brushes is the squirrel cage induction motors do not contain brushes,
motor. slip rings, commutators, permanent magnets, position
, Electrical Mechanic/Test Technician
A. DC shunt sensors, or other components that increase their overall
B. DC series cost. Their simple construction ensures they are gener-
C. Squirrel cage induction ally easy to install and maintain.
D. Compound
24. Of the following materials, the D. Nichrome. Most heating elements use Nichrome
one that is COMMONLY used as 80/20, which is 80% nickel and 20% chromium.
an electric heating element in an Nichrome is ideal because it has high resistance and
electric heater is... forms a chromium oxide layer when heated for the first
A. Zinc time.
B. Brass
C. Terne plate
D. Nichrome
25. A bolt is specified as 1/4-28 means Bolt is 1/4 inch in diameter and has 28 threads per inch
the...
26. Name 3 basic components of the Proton, neutron, electron
atom:
27. Two opposing forces hold the Centrifugal force & electrical attraction
electron in place. They are
force and attraction.
28. electromotive force (emf) Electrons can be moved from one atom to another by
applying some form of or pressure.
29. Amperage (amps) The measurement of the amount of electricity flowing
past a given point in a conductor per second (i.e., cur-
rent).
30. Voltage an electromotive force or potential ditterence expressed
in volts.
, Electrical Mechanic/Test Technician
31. Resistance to the flow of electrons Ohms (Ω)
is measured in .
32. The difference in voltage between Electrical
two points is called poten-
tial.
33. Alternating current will produce a Sine
wave.
34. Hertz (Hz) Unit of measurement for frequency (cycles per second).
Only for AC.
35. To measure the insulation of a Ohmmeter
rubber-covered electrical cable,
the instrument to use should be....
36. Load The work required to be done. Observed as an amper-
age draw in an electric circuit.
37. voltage drop The ditterence in an electrical potential between two
points.
38. Short circuit A connection that allows current to take an unintended
path.
39. True statement Whenever current flows through resistance, heat is pro-
duced.
40. What is an ampere? A measure of current.
Equals one coulomb passing a given point in one sec-
ond. A measure of electricity flowing through a circuit.
41. Ohm's law equation
