CFESA Electrical Certification Exam
2026/2027 | 250+ Practice Questions, Correct
Answers & Detailed Rationales
1. What is Ohm’s law?
A) V = I / R
B) V = I × R
C) I = V × R
D) R = V × I
Answer: B
Rationale: Voltage equals current times resistance.
2. What is the unit of electrical resistance?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: C
Rationale: Resistance is measured in ohms (Ω).
3. What is the unit of electrical current?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: B
Rationale: Current is measured in amperes (amps).
,4. What is the unit of electrical voltage?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: A
Rationale: Voltage is electrical potential difference, measured in volts.
5. What is the unit of electrical power?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: D
Rationale: Power is measured in watts.
6. What formula calculates power in a DC circuit?
A) P = V / I
B) P = V × I
C) P = I / R
D) P = R × I
Answer: B
Rationale: Power in watts equals volts times amps.
7. One horsepower equals approximately how many watts?
A) 500 W
,B) 746 W
C) 1000 W
D) 1200 W
Answer: B
Rationale: 1 hp = 746 watts.
8. Which meter measures current without breaking the circuit?
A) Voltmeter
B) Clamp-on ammeter
C) Ohmmeter
D) Megohmmeter
Answer: B
Rationale: Clamp meters sense magnetic field around a conductor.
9. How is a voltmeter connected?
A) In series
B) In parallel
C) In series-parallel
D) Across a capacitor only
Answer: B
Rationale: Voltmeters measure potential difference across two points.
10. How is an ammeter connected?
A) In series
B) In parallel
C) Across a resistor
D) Across a switch
Answer: A
, Rationale: Ammeters carry circuit current, so they are wired in series.
11. Before using an ohmmeter, you must:
A) Energize the circuit
B) De-energize the circuit
C) Short the leads
D) Set to DC volts
Answer: B
Rationale: Ohmmeters supply their own voltage; external power damages the meter.
12. Continuity mode on a multimeter will:
A) Measure voltage
B) Beep if the circuit is complete
C) Measure capacitance
D) Measure temperature
Answer: B
Rationale: Continuity checks for closed paths and opens.
13. What is the purpose of a fuse?
A) Increase voltage
B) Protect circuit from overcurrent
C) Store energy
D) Rectify AC
Answer: B
Rationale: Fuses melt and open the circuit when current exceeds rating.
14. What is the purpose of a circuit breaker?
2026/2027 | 250+ Practice Questions, Correct
Answers & Detailed Rationales
1. What is Ohm’s law?
A) V = I / R
B) V = I × R
C) I = V × R
D) R = V × I
Answer: B
Rationale: Voltage equals current times resistance.
2. What is the unit of electrical resistance?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: C
Rationale: Resistance is measured in ohms (Ω).
3. What is the unit of electrical current?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: B
Rationale: Current is measured in amperes (amps).
,4. What is the unit of electrical voltage?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: A
Rationale: Voltage is electrical potential difference, measured in volts.
5. What is the unit of electrical power?
A) Volt
B) Ampere
C) Ohm
D) Watt
Answer: D
Rationale: Power is measured in watts.
6. What formula calculates power in a DC circuit?
A) P = V / I
B) P = V × I
C) P = I / R
D) P = R × I
Answer: B
Rationale: Power in watts equals volts times amps.
7. One horsepower equals approximately how many watts?
A) 500 W
,B) 746 W
C) 1000 W
D) 1200 W
Answer: B
Rationale: 1 hp = 746 watts.
8. Which meter measures current without breaking the circuit?
A) Voltmeter
B) Clamp-on ammeter
C) Ohmmeter
D) Megohmmeter
Answer: B
Rationale: Clamp meters sense magnetic field around a conductor.
9. How is a voltmeter connected?
A) In series
B) In parallel
C) In series-parallel
D) Across a capacitor only
Answer: B
Rationale: Voltmeters measure potential difference across two points.
10. How is an ammeter connected?
A) In series
B) In parallel
C) Across a resistor
D) Across a switch
Answer: A
, Rationale: Ammeters carry circuit current, so they are wired in series.
11. Before using an ohmmeter, you must:
A) Energize the circuit
B) De-energize the circuit
C) Short the leads
D) Set to DC volts
Answer: B
Rationale: Ohmmeters supply their own voltage; external power damages the meter.
12. Continuity mode on a multimeter will:
A) Measure voltage
B) Beep if the circuit is complete
C) Measure capacitance
D) Measure temperature
Answer: B
Rationale: Continuity checks for closed paths and opens.
13. What is the purpose of a fuse?
A) Increase voltage
B) Protect circuit from overcurrent
C) Store energy
D) Rectify AC
Answer: B
Rationale: Fuses melt and open the circuit when current exceeds rating.
14. What is the purpose of a circuit breaker?
