ESCO ELECTRICAL CERTIFICATION EXAM 2026 / STUDY GUIDE / ACTUAL EXAM QUESTIONS AND
ANSWERS GOOD GRADE IS WELL GUARANTEED GRADE A+
What is current flow? ✔️D.The flow of electrons in a circuit
What is impedance? ✔️A.Opposition to alternating current
Like charges will ✔️B.Repel each other
Any material that will readily release electrons is called: ✔️B.A conductor
The symbol for current is: ✔️B. I
Electricity can produce: ✔️D. All the above
light
heat
magnetism
The safety ground conductor is usually colored: ✔️B.Green
An electron has: ✔️B.A negative charge
Which of the following materials would be best suited for use as a semi-conductor? ✔️D.Silicon
Which of the following meters must use internal power to check a load or circuit? ✔️A.Ohmmeter
What would be the result if a 24 volt, 20 ohm contactor coil was wired in series with a 24 volt, 200 ohm
control relay? ✔️B.Only the control relay would operate
Three defrost heaters, each 15 ohms, are wired in parallel to a 120 volt power supply. How many Watts
are consumed? ✔️C. 2880
When testing a capacitor with an analog or digital ohmmeter, the meter should: ✔️B.Measure low
resistance then return to a high reading
How much resistance must be placed in a 120 volt circuit to limit the current to 2 amps? ✔️A.60 ohms
What is resistance? ✔️A.Opposition to electron flow
In electrical wiring, a black colored wire indicates: ✔️A. A hot conductor
How many watts are used by a heater operating on 460 volts and drawing 5 amps? ✔️D .2300
How are fuses sized? ✔️D .Both A and B
What is generally considered the maximum allowable supply voltage variation ✔️A.5%
, Capacitors are rated in: ✔️D .Both B and C
What is the term used to describe the output side of a transformer? ✔️D .Secondary side
One horsepower is equal to ______ watts. ✔️B. 746
A parallel circuit contains an 18 ohm and a 9 ohm resistor. What is the total resistance? ✔️A.6 ohms
In a series circuit, the voltage drop across each load will: ✔️D .Add up to equal the source voltage
Which of the following is equal to 2.1kW? ✔️c .2100 watts
A capacitor analyzer is designed to check: ✔️D .The capacitance of the a capacitor
On an electronic oil safety switch, what changes the pressure signal to an electrical signal?
✔️A.Transducer
A three phase load requires a minimum of ✔️A.Three supply lines
An electronically commutated motor (ECM) is designed to: ✔️D .Provide proper airflow under various
conditions
Resistance can be calculated by: ✔️A.E divided by I
The total resistance in a parallel circuit will be: ✔️D .Less than the smallest resistance
Which of the following statements about current is true? ✔️B.Current flow will increase when voltage
increases
When resistors are wired parallel: ✔️B.The voltage drop across each resistor will be the same as the
applied source voltage
Which of the following is equal to 100 milliamps? ✔️C. 0.10 amps
The meter on a house measures the ____ passing through it. ✔️C. Watts
What is the correct formula for determining wattage? ✔️A.W = E x I
A parallel circuit consists of three resistors; R1 = 30 ohms, R2 = 15 ohms, R3 = 10 ohms. If the current
through R2 = 4 amps, what is the source voltage? ✔️B.60 volts
Three 300 ohm resistors are wired parallel. What is the total resistance? ✔️A.100 ohms
Amps can be calculated by: ✔️A. E/R
B.W/E
C.The square root of W/R
answer: D. all the above
Voltage can be calculated by: ✔️C.IxR
ANSWERS GOOD GRADE IS WELL GUARANTEED GRADE A+
What is current flow? ✔️D.The flow of electrons in a circuit
What is impedance? ✔️A.Opposition to alternating current
Like charges will ✔️B.Repel each other
Any material that will readily release electrons is called: ✔️B.A conductor
The symbol for current is: ✔️B. I
Electricity can produce: ✔️D. All the above
light
heat
magnetism
The safety ground conductor is usually colored: ✔️B.Green
An electron has: ✔️B.A negative charge
Which of the following materials would be best suited for use as a semi-conductor? ✔️D.Silicon
Which of the following meters must use internal power to check a load or circuit? ✔️A.Ohmmeter
What would be the result if a 24 volt, 20 ohm contactor coil was wired in series with a 24 volt, 200 ohm
control relay? ✔️B.Only the control relay would operate
Three defrost heaters, each 15 ohms, are wired in parallel to a 120 volt power supply. How many Watts
are consumed? ✔️C. 2880
When testing a capacitor with an analog or digital ohmmeter, the meter should: ✔️B.Measure low
resistance then return to a high reading
How much resistance must be placed in a 120 volt circuit to limit the current to 2 amps? ✔️A.60 ohms
What is resistance? ✔️A.Opposition to electron flow
In electrical wiring, a black colored wire indicates: ✔️A. A hot conductor
How many watts are used by a heater operating on 460 volts and drawing 5 amps? ✔️D .2300
How are fuses sized? ✔️D .Both A and B
What is generally considered the maximum allowable supply voltage variation ✔️A.5%
, Capacitors are rated in: ✔️D .Both B and C
What is the term used to describe the output side of a transformer? ✔️D .Secondary side
One horsepower is equal to ______ watts. ✔️B. 746
A parallel circuit contains an 18 ohm and a 9 ohm resistor. What is the total resistance? ✔️A.6 ohms
In a series circuit, the voltage drop across each load will: ✔️D .Add up to equal the source voltage
Which of the following is equal to 2.1kW? ✔️c .2100 watts
A capacitor analyzer is designed to check: ✔️D .The capacitance of the a capacitor
On an electronic oil safety switch, what changes the pressure signal to an electrical signal?
✔️A.Transducer
A three phase load requires a minimum of ✔️A.Three supply lines
An electronically commutated motor (ECM) is designed to: ✔️D .Provide proper airflow under various
conditions
Resistance can be calculated by: ✔️A.E divided by I
The total resistance in a parallel circuit will be: ✔️D .Less than the smallest resistance
Which of the following statements about current is true? ✔️B.Current flow will increase when voltage
increases
When resistors are wired parallel: ✔️B.The voltage drop across each resistor will be the same as the
applied source voltage
Which of the following is equal to 100 milliamps? ✔️C. 0.10 amps
The meter on a house measures the ____ passing through it. ✔️C. Watts
What is the correct formula for determining wattage? ✔️A.W = E x I
A parallel circuit consists of three resistors; R1 = 30 ohms, R2 = 15 ohms, R3 = 10 ohms. If the current
through R2 = 4 amps, what is the source voltage? ✔️B.60 volts
Three 300 ohm resistors are wired parallel. What is the total resistance? ✔️A.100 ohms
Amps can be calculated by: ✔️A. E/R
B.W/E
C.The square root of W/R
answer: D. all the above
Voltage can be calculated by: ✔️C.IxR
