2021 ABYC Marine Electrical Page 1 4/9/2026
2021 ABYC Marine Electrical
___ through circuits on a boat is perhaps the most common problem with electrical
circuitry.
A Overly high rates of current flow
B Resistance to heat
C Unrestricted pressure
D Resistance to electrical current flow - correct answer-D Resistance to electrical
current flow
When using Ohm's law, if any two of the three values are known, the third value can
be calculated by ___.
A multiplication or division
B addition or subtraction
C taking the square root of the sum of the two values
D finding the inverse of the highest known value - correct answer-A multiplication or
division
If the voltage in a circuit is 12 volts and the resistance is 3 ohms, Ohm's law can be
used to find that the rate of flow is ___ amps.
A9
B6
C4
D 2 - correct answer-C. 4
If resistance decreases and the voltage remains constant in a circuit, then the
amperage will ___.
A decrease
B increase
C remain constant
D be canceled out - correct answer-B increase
The unit of measure for power is the ___.
A watt
B amp
C volt
D ohm - correct answer-A watt
A microwave oven with a wattage of 1.2 KW (1,200 watts) and a 120 VAC will draw
___ amps.
A 100
B 60
C 20
2021 ABYC Marine Electrical 1 of 7 2021 ABYC Marine Electrical.pdf
, 2021 ABYC Marine Electrical Page 2 4/9/2026
D 10 - correct answer-D 10
Cranking motor (engine starter) circuits are not required to have ___. - correct
answer-overcurrent protection
In a ___ circuit, there is only one path allowed for electrical flow.
A parallel
B simple
C series
D starter - correct answer-C series
In a series circuit, the amperage (current) is ___.
A the same everywhere it is measured
B gradually decreased as the circuit runs farther from the power source
C lowest at (or very close to) the power source
D gradually increased as the circuit runs farther from the power source - correct
answer-the same everywhere it is measured
In all circuits, voltage is lost as it travels through the circuit, which is commonly
referred to as ___.
A electrical resistance
B voltage drop
C short circuiting
D open circuiting - correct answer-B voltage drop
The most common type of circuit fault is a(n) ___.
A burnt-out circuit
B intercircuit short
C open circuit
D internal short - correct answer-C open circuit (Really should be Unwanted Open)
The ___ is the most dangerous type of short circuit.
A open circuit
B internal short
C intercircuit short
D short circuit to ground - correct answer-D short circuit to ground
Intercircuit shorts are usually caused by ___.
A inadequate ventilation in the area where the circuit is installed
B water migration into a device
C an errant screw sticking through a loom or wiring harness
D insulation breakdown of the circuit components - correct answer-C an errant screw
sticking through a loom or wiring harness
2021 ABYC Marine Electrical 2 of 7 2021 ABYC Marine Electrical.pdf
2021 ABYC Marine Electrical
___ through circuits on a boat is perhaps the most common problem with electrical
circuitry.
A Overly high rates of current flow
B Resistance to heat
C Unrestricted pressure
D Resistance to electrical current flow - correct answer-D Resistance to electrical
current flow
When using Ohm's law, if any two of the three values are known, the third value can
be calculated by ___.
A multiplication or division
B addition or subtraction
C taking the square root of the sum of the two values
D finding the inverse of the highest known value - correct answer-A multiplication or
division
If the voltage in a circuit is 12 volts and the resistance is 3 ohms, Ohm's law can be
used to find that the rate of flow is ___ amps.
A9
B6
C4
D 2 - correct answer-C. 4
If resistance decreases and the voltage remains constant in a circuit, then the
amperage will ___.
A decrease
B increase
C remain constant
D be canceled out - correct answer-B increase
The unit of measure for power is the ___.
A watt
B amp
C volt
D ohm - correct answer-A watt
A microwave oven with a wattage of 1.2 KW (1,200 watts) and a 120 VAC will draw
___ amps.
A 100
B 60
C 20
2021 ABYC Marine Electrical 1 of 7 2021 ABYC Marine Electrical.pdf
, 2021 ABYC Marine Electrical Page 2 4/9/2026
D 10 - correct answer-D 10
Cranking motor (engine starter) circuits are not required to have ___. - correct
answer-overcurrent protection
In a ___ circuit, there is only one path allowed for electrical flow.
A parallel
B simple
C series
D starter - correct answer-C series
In a series circuit, the amperage (current) is ___.
A the same everywhere it is measured
B gradually decreased as the circuit runs farther from the power source
C lowest at (or very close to) the power source
D gradually increased as the circuit runs farther from the power source - correct
answer-the same everywhere it is measured
In all circuits, voltage is lost as it travels through the circuit, which is commonly
referred to as ___.
A electrical resistance
B voltage drop
C short circuiting
D open circuiting - correct answer-B voltage drop
The most common type of circuit fault is a(n) ___.
A burnt-out circuit
B intercircuit short
C open circuit
D internal short - correct answer-C open circuit (Really should be Unwanted Open)
The ___ is the most dangerous type of short circuit.
A open circuit
B internal short
C intercircuit short
D short circuit to ground - correct answer-D short circuit to ground
Intercircuit shorts are usually caused by ___.
A inadequate ventilation in the area where the circuit is installed
B water migration into a device
C an errant screw sticking through a loom or wiring harness
D insulation breakdown of the circuit components - correct answer-C an errant screw
sticking through a loom or wiring harness
2021 ABYC Marine Electrical 2 of 7 2021 ABYC Marine Electrical.pdf
