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ESCO ELECTRICAL CERTIFICATION 2025
QUESTIONS AND ANSWERS.
What is current flow? - correct answer - The flow of electrons in a circuit.
What is impedance? - correct answer - opposition to alternating currents
Like charges will - correct answer - Repel each other
Any material that will readily release electrons is called - correct answer -
conductor
Symbol for current - correct answer - I (amps)
Electricity can produce: - correct answer - All the above
light
heat
magnetism
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The safety ground conductor is usually colored: - correct answer - Green
An electron has a ____ - correct answer - negative charge
Which of the following materials would be best suited for use as a semi-
conductor? - correct answer - Silicon
Which of the following meters must use internal power to check a load or
circuit? - correct answer - 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? - correct answer - 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? - correct answer - 2880
When testing a capacitor with an analog or digital ohmmeter, the meter
should: - correct answer - Measure low resistance then return to a high
reading.
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How much resistance must be placed in a 120 volt circuit to limit the current
to 2 amps? - correct answer - 60 ohms
What is resistance? - correct answer - opposition to electron flow
In electrical wiring, a black colored wire indicates - correct answer - A hot
conductor
How many watts are used by a heater operating on 460 volts and drawing
5 amps? - correct answer - 2300
How are fuses sized?
A: By amperage
B: By microfarads
C: By voltage
D: Both a and c - correct answer - Both A and C
ESCO ELECTRICAL CERTIFICATION 2025
QUESTIONS AND ANSWERS.
What is current flow? - correct answer - The flow of electrons in a circuit.
What is impedance? - correct answer - opposition to alternating currents
Like charges will - correct answer - Repel each other
Any material that will readily release electrons is called - correct answer -
conductor
Symbol for current - correct answer - I (amps)
Electricity can produce: - correct answer - All the above
light
heat
magnetism
, Page |2
The safety ground conductor is usually colored: - correct answer - Green
An electron has a ____ - correct answer - negative charge
Which of the following materials would be best suited for use as a semi-
conductor? - correct answer - Silicon
Which of the following meters must use internal power to check a load or
circuit? - correct answer - 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? - correct answer - 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? - correct answer - 2880
When testing a capacitor with an analog or digital ohmmeter, the meter
should: - correct answer - Measure low resistance then return to a high
reading.
, Page |3
How much resistance must be placed in a 120 volt circuit to limit the current
to 2 amps? - correct answer - 60 ohms
What is resistance? - correct answer - opposition to electron flow
In electrical wiring, a black colored wire indicates - correct answer - A hot
conductor
How many watts are used by a heater operating on 460 volts and drawing
5 amps? - correct answer - 2300
How are fuses sized?
A: By amperage
B: By microfarads
C: By voltage
D: Both a and c - correct answer - Both A and C
