NYC DCAS Electrician Exam Questions With Correct
Answers (Verified Answers) Plus Rationales Q&A
NYC DCAS ELECTRICIAN EXAM – STUDY GUIDE ORIGINAL PRACTICE
QUESTIONS Based on Verified Exam Content Areas Answers + NEC Code
References
SECTION 1: ELECTRICAL THEORY
QUESTION 1
According to Ohm's Law, what is the correct formula for calculating voltage?
A) V = I / R
B) V = I × R
C) V = R / I
D) V = P × I
Correct Answer: B
Rationale: Ohm's Law states that voltage equals current multiplied by resistance (V
= I × R). Option A calculates current (I = V/R), option C inverts the relationship,
1
,and option D uses the power formula (P = V × I) incorrectly rearranged
[citation:2][citation:7][citation:9].
QUESTION 2
A 240V single-phase circuit supplies a 4800W electric water heater. What is the
current draw?
A) 15A
B) 20A
C) 25A
D) 30A
Correct Answer: B
Rationale: Using the power formula P = V × I, rearrange to I = P ÷ V = 4800W ÷
240V = 20 amperes [citation:2][citation:7][citation:9].
QUESTION 3
What is the unit of electrical resistance?
2
,A) Volt
B) Ampere
C) Ohm
D) Watt
Correct Answer: C
Rationale: The ohm (Ω) is the SI unit of electrical resistance, measuring the
opposition to the flow of electric current. Amperes measure current, volts measure
electrical potential, and watts measure power [citation:7].
QUESTION 4
A circuit has a 120-volt source and a resistance of 24 ohms. What is the current
flowing in the circuit?
A) 2A
B) 5A
C) 10A
D) 20A
3
, Correct Answer: B
Rationale: Ohm's Law states I = E/R. I = 120V ÷ 24Ω = 5 amperes [citation:6].
QUESTION 5
What is the frequency of standard AC power in NYC?
A) 50 Hz
B) 60 Hz
C) 120 Hz
D) 400 Hz
Correct Answer: B
Rationale: The United States, including New York City, operates on 60 Hz AC
power (60 cycles per second). Europe and many other countries use 50 Hz
[citation:2][citation:7].
4
Answers (Verified Answers) Plus Rationales Q&A
NYC DCAS ELECTRICIAN EXAM – STUDY GUIDE ORIGINAL PRACTICE
QUESTIONS Based on Verified Exam Content Areas Answers + NEC Code
References
SECTION 1: ELECTRICAL THEORY
QUESTION 1
According to Ohm's Law, what is the correct formula for calculating voltage?
A) V = I / R
B) V = I × R
C) V = R / I
D) V = P × I
Correct Answer: B
Rationale: Ohm's Law states that voltage equals current multiplied by resistance (V
= I × R). Option A calculates current (I = V/R), option C inverts the relationship,
1
,and option D uses the power formula (P = V × I) incorrectly rearranged
[citation:2][citation:7][citation:9].
QUESTION 2
A 240V single-phase circuit supplies a 4800W electric water heater. What is the
current draw?
A) 15A
B) 20A
C) 25A
D) 30A
Correct Answer: B
Rationale: Using the power formula P = V × I, rearrange to I = P ÷ V = 4800W ÷
240V = 20 amperes [citation:2][citation:7][citation:9].
QUESTION 3
What is the unit of electrical resistance?
2
,A) Volt
B) Ampere
C) Ohm
D) Watt
Correct Answer: C
Rationale: The ohm (Ω) is the SI unit of electrical resistance, measuring the
opposition to the flow of electric current. Amperes measure current, volts measure
electrical potential, and watts measure power [citation:7].
QUESTION 4
A circuit has a 120-volt source and a resistance of 24 ohms. What is the current
flowing in the circuit?
A) 2A
B) 5A
C) 10A
D) 20A
3
, Correct Answer: B
Rationale: Ohm's Law states I = E/R. I = 120V ÷ 24Ω = 5 amperes [citation:6].
QUESTION 5
What is the frequency of standard AC power in NYC?
A) 50 Hz
B) 60 Hz
C) 120 Hz
D) 400 Hz
Correct Answer: B
Rationale: The United States, including New York City, operates on 60 Hz AC
power (60 cycles per second). Europe and many other countries use 50 Hz
[citation:2][citation:7].
4
