LADWP CONTINUITY & RESISTANCE
TESTING PRACTICE EXAM WITH
QUESTIONS AND VERIFIED ANSWERS,
PLUS DETAILED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. During a continuity test on a de-energized electrical circuit, an
operator places the test leads across two points that should be
electrically connected through a conductor. The meter displays a
resistance value that is extremely high and fluctuates toward the
open-circuit indication. Which condition is the most likely
explanation?
A. The conductor has excellent continuity
B. The circuit contains an unintended short circuit
C. The conductor or connection is open or has a severe interruption
D. The meter is automatically compensating for lead resistance
Answer: C. The conductor or connection is open or has a severe
interruption
Rationale: A continuity test is intended to verify that an electrically
conductive path exists between two designated points. A very high or
open-circuit reading indicates that current cannot pass through the
intended path, which can result from a broken conductor,
disconnected terminal, failed splice, open contact, or severely damaged
connection. A low resistance value would normally indicate continuity.
Before concluding that the conductor itself is defective, the technician
1
,should verify test-lead contact, instrument operation, circuit isolation,
and the applicable procedure.
2. Why is it important to verify that a circuit is properly de-
energized before performing a conventional low-resistance
continuity test?
A. Energized circuits always produce exactly zero resistance
B. The test instrument may be damaged and personnel may be exposed
to electrical hazards
C. De-energization increases the conductor's physical diameter
D. Continuity measurements cannot be performed on copper conductors
Answer: B. The test instrument may be damaged and personnel may
be exposed to electrical hazards
Rationale: A conventional resistance or continuity instrument applies
a test signal to the circuit. Connecting such an instrument to an
energized circuit can expose the technician to hazardous voltage and
may subject the meter to voltages beyond its design rating. Proper
isolation, verification of absence of voltage, grounding or discharge as
required, and compliance with applicable electrical safety procedures
are therefore fundamental prerequisites. De-energization is a safety
requirement, not merely a measurement preference.
3. A technician measures a very low resistance across a copper
conductor that is expected to be continuous. Which interpretation is
generally most appropriate?
A. The result is potentially consistent with a good conductive path
B. The conductor must be open
C. The result proves the conductor is mechanically intact under all
2
,conditions
D. The conductor necessarily contains an insulation failure
Answer: A. The result is potentially consistent with a good
conductive path
Rationale: A continuous metallic conductor normally exhibits
relatively low resistance, particularly when the test distance is short
and the conductor has substantial cross-sectional area. However, a
low resistance measurement alone does not prove that every
mechanical connection is reliable under load or vibration. The
technician must compare the measured value with expected values,
conductor length and size, connection requirements, and historical or
baseline results. Continuity is evidence of a conductive path, not a
complete mechanical or operational certification.
4. A resistance meter initially displays a value of 0.42 Ω. When the
test leads are shorted directly together, the meter displays 0.18 Ω.
What is the most appropriate interpretation of the original
measurement?
A. The circuit resistance is exactly 0.60 Ω
B. The circuit has no resistance
C. The meter is measuring only insulation resistance
D. The lead/contact contribution should be considered when determining
the actual circuit resistance
Answer: D. The lead/contact contribution should be considered
when determining the actual circuit resistance
Rationale: Test leads and their connections have resistance. In low-
resistance measurements, even a few hundredths or tenths of an ohm
can be significant relative to the device being tested. A common
conceptual correction is to account for the resistance measured when
3
, the leads are shorted, provided the instrument and procedure call for
that approach. Many precision low-resistance instruments provide
zeroing or lead-compensation functions specifically to minimize this
error. The technician should follow the instrument manufacturer's
procedure and applicable LADWP testing requirements.
5. Which instrument feature is particularly valuable when
measuring very low resistance in conductors, bus connections,
switches, or bonding paths?
A. High-voltage insulation test capability only
B. Audible continuity without a numerical display
C. Lead compensation or zeroing capability
D. Frequency measurement capability
Answer: C. Lead compensation or zeroing capability
Rationale: When resistance values are very small, the resistance of the
test leads and their contact points can become a substantial portion of
the measurement. Lead compensation, zeroing, or an appropriate
four-wire Kelvin measurement technique can substantially reduce the
effect of lead resistance. This is especially important when evaluating
joints, bus connections, bonding conductors, switch contacts, and
other low-resistance paths where milliohm-level differences can
matter.
6. A technician obtains different resistance readings each time the
probe is moved slightly on the same terminal. What should be
investigated first?
A. Whether the test point is clean and the probe has a stable electrical
contact
B. Whether the conductor has become superconductive
4
TESTING PRACTICE EXAM WITH
QUESTIONS AND VERIFIED ANSWERS,
PLUS DETAILED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1. During a continuity test on a de-energized electrical circuit, an
operator places the test leads across two points that should be
electrically connected through a conductor. The meter displays a
resistance value that is extremely high and fluctuates toward the
open-circuit indication. Which condition is the most likely
explanation?
A. The conductor has excellent continuity
B. The circuit contains an unintended short circuit
C. The conductor or connection is open or has a severe interruption
D. The meter is automatically compensating for lead resistance
Answer: C. The conductor or connection is open or has a severe
interruption
Rationale: A continuity test is intended to verify that an electrically
conductive path exists between two designated points. A very high or
open-circuit reading indicates that current cannot pass through the
intended path, which can result from a broken conductor,
disconnected terminal, failed splice, open contact, or severely damaged
connection. A low resistance value would normally indicate continuity.
Before concluding that the conductor itself is defective, the technician
1
,should verify test-lead contact, instrument operation, circuit isolation,
and the applicable procedure.
2. Why is it important to verify that a circuit is properly de-
energized before performing a conventional low-resistance
continuity test?
A. Energized circuits always produce exactly zero resistance
B. The test instrument may be damaged and personnel may be exposed
to electrical hazards
C. De-energization increases the conductor's physical diameter
D. Continuity measurements cannot be performed on copper conductors
Answer: B. The test instrument may be damaged and personnel may
be exposed to electrical hazards
Rationale: A conventional resistance or continuity instrument applies
a test signal to the circuit. Connecting such an instrument to an
energized circuit can expose the technician to hazardous voltage and
may subject the meter to voltages beyond its design rating. Proper
isolation, verification of absence of voltage, grounding or discharge as
required, and compliance with applicable electrical safety procedures
are therefore fundamental prerequisites. De-energization is a safety
requirement, not merely a measurement preference.
3. A technician measures a very low resistance across a copper
conductor that is expected to be continuous. Which interpretation is
generally most appropriate?
A. The result is potentially consistent with a good conductive path
B. The conductor must be open
C. The result proves the conductor is mechanically intact under all
2
,conditions
D. The conductor necessarily contains an insulation failure
Answer: A. The result is potentially consistent with a good
conductive path
Rationale: A continuous metallic conductor normally exhibits
relatively low resistance, particularly when the test distance is short
and the conductor has substantial cross-sectional area. However, a
low resistance measurement alone does not prove that every
mechanical connection is reliable under load or vibration. The
technician must compare the measured value with expected values,
conductor length and size, connection requirements, and historical or
baseline results. Continuity is evidence of a conductive path, not a
complete mechanical or operational certification.
4. A resistance meter initially displays a value of 0.42 Ω. When the
test leads are shorted directly together, the meter displays 0.18 Ω.
What is the most appropriate interpretation of the original
measurement?
A. The circuit resistance is exactly 0.60 Ω
B. The circuit has no resistance
C. The meter is measuring only insulation resistance
D. The lead/contact contribution should be considered when determining
the actual circuit resistance
Answer: D. The lead/contact contribution should be considered
when determining the actual circuit resistance
Rationale: Test leads and their connections have resistance. In low-
resistance measurements, even a few hundredths or tenths of an ohm
can be significant relative to the device being tested. A common
conceptual correction is to account for the resistance measured when
3
, the leads are shorted, provided the instrument and procedure call for
that approach. Many precision low-resistance instruments provide
zeroing or lead-compensation functions specifically to minimize this
error. The technician should follow the instrument manufacturer's
procedure and applicable LADWP testing requirements.
5. Which instrument feature is particularly valuable when
measuring very low resistance in conductors, bus connections,
switches, or bonding paths?
A. High-voltage insulation test capability only
B. Audible continuity without a numerical display
C. Lead compensation or zeroing capability
D. Frequency measurement capability
Answer: C. Lead compensation or zeroing capability
Rationale: When resistance values are very small, the resistance of the
test leads and their contact points can become a substantial portion of
the measurement. Lead compensation, zeroing, or an appropriate
four-wire Kelvin measurement technique can substantially reduce the
effect of lead resistance. This is especially important when evaluating
joints, bus connections, bonding conductors, switch contacts, and
other low-resistance paths where milliohm-level differences can
matter.
6. A technician obtains different resistance readings each time the
probe is moved slightly on the same terminal. What should be
investigated first?
A. Whether the test point is clean and the probe has a stable electrical
contact
B. Whether the conductor has become superconductive
4
