LADWP ELECTRICAL CRAFT HELPER EXAM ACTUAL 2026/2027
TEST BANK PRACTICE QUESTIONS AND STUDY GUIDE
ACCURATE EXAM COMPLETE REAL QUESTIONS WITH WELL
ELABORATED ANSWERS AND DETAILED RATIONALES
(RELIABLE ANSWERS) CURRENTLY UPDATED VERSION 2026
EDITION |GUARANTEED PASS A+ |INSTANT DOWNLOAD PDF
|BRAND NEW!!
1. What is the unit of measurement for electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Correct Answer: C – Resistance is measured in ohms (Ω), defined by
Ohm's Law as voltage divided by current; one ohm equals one volt
per ampere.
Rationale: The ohm is the SI-derived unit for electrical resistance. A
component has a resistance of one ohm when a voltage of one volt
produces a current of one ampere through it.
2. Which metal is the best conductor of electricity among common
wiring materials?
A. Aluminum
,B. Copper
C. Steel
D. Silver
Correct Answer: B – Copper has the highest conductivity among
common wiring materials used in electrical installations, surpassing
aluminum and far exceeding non-conductors like steel.
Rationale: While silver is actually the best conductor overall, copper
is the most commonly used practical conductor in electrical wiring
due to its excellent conductivity, cost-effectiveness, and availability.
3. Using Ohm's law, what current should flow through a 20-ohm
load connected across a 120-volt source?
A. 12 amperes
B. 24 amperes
C. 6 amperes
D. 2 amperes
Correct Answer: C – Ohm's law gives I = V/R, so 120 divided by 20
equals 6 amperes.
,Rationale: Ohm's Law states that current (I) equals voltage (V)
divided by resistance (R). Substituting the given values: I = 120V ÷
20Ω = 6A.
4. What is the resistance of a conductor with 10 volts applied and 2
amperes flowing?
A. 2 ohms
B. 5 ohms
C. 10 ohms
D. 20 ohms
Correct Answer: B – Ohm's Law: R = V/I = 10/2 = 5 ohms.
Rationale: Using Ohm's Law rearranged as R = V/I, the resistance
equals 10 volts divided by 2 amperes, which equals 5 ohms.
5. Which electrical quantity represents the opposition that a material
or component provides against the flow of electric current?
A. Power
B. Frequency
C. Voltage
D. Resistance
, Correct Answer: D – Resistance is the opposition to current flow and
is measured in ohms.
Rationale: Resistance is the property of a material that opposes the
flow of electric current. It is determined by the material's
composition, cross-sectional area, length, and temperature.
6. Which unit is used to express electrical power in ordinary circuit
calculations?
A. Watt
B. Volt
C. Ampere
D. Ohm
Correct Answer: A – The watt is the SI-derived unit commonly used
for electrical power.
Rationale: Electrical power is measured in watts, which represent the
rate at which electrical energy is transferred. One watt equals one
joule per second.
7. In a series circuit, what happens when one component fails as an
open circuit?
TEST BANK PRACTICE QUESTIONS AND STUDY GUIDE
ACCURATE EXAM COMPLETE REAL QUESTIONS WITH WELL
ELABORATED ANSWERS AND DETAILED RATIONALES
(RELIABLE ANSWERS) CURRENTLY UPDATED VERSION 2026
EDITION |GUARANTEED PASS A+ |INSTANT DOWNLOAD PDF
|BRAND NEW!!
1. What is the unit of measurement for electrical resistance?
A. Volt
B. Ampere
C. Ohm
D. Watt
Correct Answer: C – Resistance is measured in ohms (Ω), defined by
Ohm's Law as voltage divided by current; one ohm equals one volt
per ampere.
Rationale: The ohm is the SI-derived unit for electrical resistance. A
component has a resistance of one ohm when a voltage of one volt
produces a current of one ampere through it.
2. Which metal is the best conductor of electricity among common
wiring materials?
A. Aluminum
,B. Copper
C. Steel
D. Silver
Correct Answer: B – Copper has the highest conductivity among
common wiring materials used in electrical installations, surpassing
aluminum and far exceeding non-conductors like steel.
Rationale: While silver is actually the best conductor overall, copper
is the most commonly used practical conductor in electrical wiring
due to its excellent conductivity, cost-effectiveness, and availability.
3. Using Ohm's law, what current should flow through a 20-ohm
load connected across a 120-volt source?
A. 12 amperes
B. 24 amperes
C. 6 amperes
D. 2 amperes
Correct Answer: C – Ohm's law gives I = V/R, so 120 divided by 20
equals 6 amperes.
,Rationale: Ohm's Law states that current (I) equals voltage (V)
divided by resistance (R). Substituting the given values: I = 120V ÷
20Ω = 6A.
4. What is the resistance of a conductor with 10 volts applied and 2
amperes flowing?
A. 2 ohms
B. 5 ohms
C. 10 ohms
D. 20 ohms
Correct Answer: B – Ohm's Law: R = V/I = 10/2 = 5 ohms.
Rationale: Using Ohm's Law rearranged as R = V/I, the resistance
equals 10 volts divided by 2 amperes, which equals 5 ohms.
5. Which electrical quantity represents the opposition that a material
or component provides against the flow of electric current?
A. Power
B. Frequency
C. Voltage
D. Resistance
, Correct Answer: D – Resistance is the opposition to current flow and
is measured in ohms.
Rationale: Resistance is the property of a material that opposes the
flow of electric current. It is determined by the material's
composition, cross-sectional area, length, and temperature.
6. Which unit is used to express electrical power in ordinary circuit
calculations?
A. Watt
B. Volt
C. Ampere
D. Ohm
Correct Answer: A – The watt is the SI-derived unit commonly used
for electrical power.
Rationale: Electrical power is measured in watts, which represent the
rate at which electrical energy is transferred. One watt equals one
joule per second.
7. In a series circuit, what happens when one component fails as an
open circuit?
