NYC DCAS Electrician Exam Questions
With Correct Answers (Verified Answers)
Plus Rationales 2026/2027 Q&A | Instant
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Question 1
What is the unit of measurement for electrical current?
A) Volts
B) Ohms
C) Amperes
D) Watts
Answer: C - Amperes (amps) measure electrical current, the rate of electron flow. Volts
measure electrical potential, ohms measure resistance, and watts measure power .
Question 2
What is the unit of measurement for electrical resistance?
A) Volts
B) Ohms
C) Amperes
D) Watts
Answer: B - Ohms (Ω) measure electrical resistance, the opposition to current flow .
Question 3
According to Ohm's Law, which formula correctly expresses the relationship between
voltage (V), current (I), and resistance (R)?
A) V = I × R
B) V = I / R
,C) V = R / I
D) V = P × I
Answer: A - Ohm's Law states that voltage equals current multiplied by resistance (V = I
× R) .
Question 4
According to Ohm's Law, what happens to current when resistance increases while
voltage remains constant?
A) Current increases
B) Current decreases
C) Current remains the same
D) Current doubles
Answer: B - According to Ohm's Law (I = V/R), current is inversely proportional to
resistance. When resistance increases and voltage remains constant, current decreases .
Question 5
What is the formula for electrical power in a DC circuit?
A) P = I × R
B) P = V × I
C) P = V / R
D) P = I / R
Answer: B - The power formula is P = V × I (watts = volts × amperes) .
Question 6
A 120-volt circuit draws 10 amperes of current. What is the power consumption?
A) 12 watts
B) 120 watts
C) 1,200 watts
D) 12,000 watts
,Answer: C - Power = Voltage × Current = 120V × 10A = 1,200 watts .
Question 7
What is the total resistance of two 10-ohm resistors connected in series?
A) 5 ohms
B) 10 ohms
C) 20 ohms
D) 100 ohms
Answer: C - In a series circuit, resistances add together. R_total = R1 + R2 = 10Ω + 10Ω
= 20Ω .
Question 8
What is the total resistance of two 10-ohm resistors connected in parallel?
A) 5 ohms
B) 10 ohms
C) 20 ohms
D) 100 ohms
Answer: A - In a parallel circuit, the reciprocal of total resistance equals the sum of
reciprocals: 1/R_total = 1/10 + 1/10 = 2/10, so R_total = 5Ω .
Question 9
In a series circuit, how is voltage distributed?
A) Voltage is the same across all components
B) Voltage divides proportionally across components
C) Voltage is zero across all components
D) Voltage doubles across each component
Answer: B - In a series circuit, voltage divides proportionally across components based
on their resistance values .
, Question 10
In a parallel circuit, how is current distributed?
A) Current is the same through all branches
B) Current divides proportionally through branches
C) Current is zero through all branches
D) Current doubles through each branch
Answer: B - In a parallel circuit, current divides proportionally through branches based
on their resistance values .
Question 11
What does RMS stand for in AC theory?
A) Root Mean Square
B) Rated Maximum Supply
C) Resistance Measurement Standard
D) Reverse Motor Starter
Answer: A - RMS (Root Mean Square) is the effective value of an AC waveform,
equivalent to the DC value that would produce the same heating effect .
Question 12
What is the formula for three-phase power?
A) P = V × I
B) P = V × I × √3 × PF
C) P = V × I × PF
D) P = V × I × √2
Answer: B - The formula for three-phase power is P = V × I × √3 × PF, where V is line-
to-line voltage, I is line current, and PF is power factor .
Question 13
What type of current changes direction periodically?
With Correct Answers (Verified Answers)
Plus Rationales 2026/2027 Q&A | Instant
Download Pdf
Question 1
What is the unit of measurement for electrical current?
A) Volts
B) Ohms
C) Amperes
D) Watts
Answer: C - Amperes (amps) measure electrical current, the rate of electron flow. Volts
measure electrical potential, ohms measure resistance, and watts measure power .
Question 2
What is the unit of measurement for electrical resistance?
A) Volts
B) Ohms
C) Amperes
D) Watts
Answer: B - Ohms (Ω) measure electrical resistance, the opposition to current flow .
Question 3
According to Ohm's Law, which formula correctly expresses the relationship between
voltage (V), current (I), and resistance (R)?
A) V = I × R
B) V = I / R
,C) V = R / I
D) V = P × I
Answer: A - Ohm's Law states that voltage equals current multiplied by resistance (V = I
× R) .
Question 4
According to Ohm's Law, what happens to current when resistance increases while
voltage remains constant?
A) Current increases
B) Current decreases
C) Current remains the same
D) Current doubles
Answer: B - According to Ohm's Law (I = V/R), current is inversely proportional to
resistance. When resistance increases and voltage remains constant, current decreases .
Question 5
What is the formula for electrical power in a DC circuit?
A) P = I × R
B) P = V × I
C) P = V / R
D) P = I / R
Answer: B - The power formula is P = V × I (watts = volts × amperes) .
Question 6
A 120-volt circuit draws 10 amperes of current. What is the power consumption?
A) 12 watts
B) 120 watts
C) 1,200 watts
D) 12,000 watts
,Answer: C - Power = Voltage × Current = 120V × 10A = 1,200 watts .
Question 7
What is the total resistance of two 10-ohm resistors connected in series?
A) 5 ohms
B) 10 ohms
C) 20 ohms
D) 100 ohms
Answer: C - In a series circuit, resistances add together. R_total = R1 + R2 = 10Ω + 10Ω
= 20Ω .
Question 8
What is the total resistance of two 10-ohm resistors connected in parallel?
A) 5 ohms
B) 10 ohms
C) 20 ohms
D) 100 ohms
Answer: A - In a parallel circuit, the reciprocal of total resistance equals the sum of
reciprocals: 1/R_total = 1/10 + 1/10 = 2/10, so R_total = 5Ω .
Question 9
In a series circuit, how is voltage distributed?
A) Voltage is the same across all components
B) Voltage divides proportionally across components
C) Voltage is zero across all components
D) Voltage doubles across each component
Answer: B - In a series circuit, voltage divides proportionally across components based
on their resistance values .
, Question 10
In a parallel circuit, how is current distributed?
A) Current is the same through all branches
B) Current divides proportionally through branches
C) Current is zero through all branches
D) Current doubles through each branch
Answer: B - In a parallel circuit, current divides proportionally through branches based
on their resistance values .
Question 11
What does RMS stand for in AC theory?
A) Root Mean Square
B) Rated Maximum Supply
C) Resistance Measurement Standard
D) Reverse Motor Starter
Answer: A - RMS (Root Mean Square) is the effective value of an AC waveform,
equivalent to the DC value that would produce the same heating effect .
Question 12
What is the formula for three-phase power?
A) P = V × I
B) P = V × I × √3 × PF
C) P = V × I × PF
D) P = V × I × √2
Answer: B - The formula for three-phase power is P = V × I × √3 × PF, where V is line-
to-line voltage, I is line current, and PF is power factor .
Question 13
What type of current changes direction periodically?
