CFESA Electrical 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
What do the following prefixes mean? Micro,Kilo,Mega,Milli - 🧠 ANSWER
✔✔1/1,000,000, 1000, 1,000,000, 1/1000
If you know the wattage and voltage, how do you determine the current? - 🧠
ANSWER ✔✔Divide the wattage by the voltage
If you know the voltage and current how do you determine the wattage? - 🧠
ANSWER ✔✔Multiply voltage times current
If a circuit is supplied with 100 volts and the total resistance of the circuit is
200 ohms, how much current will the circuit draw? - 🧠 ANSWER ✔✔.5
amps
If a piece of equipment is supplied 208 volts and the amp meter clamped to
the hot line reads 20 amps, what is the wattage of the load? - 🧠 ANSWER
✔✔4160 Watts
How much voltage is in one hot line? - 🧠 ANSWER ✔✔None
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
,What happens to current in a parallel circuit? - 🧠 ANSWER ✔✔It divides
across resistances
what happens to voltage across the loads in a parallel circuit? - 🧠 ANSWER
✔✔stays the same
what happens to the voltage across the loads in a series circuit? - 🧠
ANSWER ✔✔it divides across the resistances
what happens to the current in a series circuit? - 🧠 ANSWER ✔✔It stays
the same everywhere
in a parallel circuit the total resistance of the circuit will always be less than
what resistance? - 🧠 ANSWER ✔✔the smallest resistance
how do you find the total resistance of a series circuit? - 🧠 ANSWER
✔✔add the resistances together
how do you find the total resistance of a parallel circuit? - 🧠 ANSWER
✔✔1/RT = 1/R1 + 1/R2 + 1/R3 ...
If a circuit is wired parallel, and the supply voltage is 120 volts, each load
must be rated at what voltage? - 🧠 ANSWER ✔✔120 volts
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
,if a circuit has two elements wired in series, and each is rated at 120 volts,
what voltage must be supplied to the circuit in order for the elements to
heat at full power? - 🧠 ANSWER ✔✔240 volts
What is the advantage of using higher voltages? - 🧠 ANSWER ✔✔Lower
Current and wire size
Is there a negative and positive line in AC power supplies? - 🧠 ANSWER
✔✔No
What is the voltage between two hot lines in a 230-volt system? - 🧠
ANSWER ✔✔230V
What is the voltage between two hot lines in a 208-volt system? - 🧠
ANSWER ✔✔208V
What is the voltage between a hot line and a neutral in a 230-volt single
phase supply? - 🧠 ANSWER ✔✔115V
What is the voltage between a hot line and a neutral in a 208-volt single
phase supply? - 🧠 ANSWER ✔✔120V
What is the accepted maximum voltage difference between the name plate
voltage and the supplied voltage? - 🧠 ANSWER ✔✔+ or - 10%
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
3
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, What is the voltage between any two hot lines of a 230 volt delta power
supply? - 🧠 ANSWER ✔✔230V
what is the voltage between a hot line and ground on a 240 volt delta
power supply - 🧠 ANSWER ✔✔No usable voltage
what is the voltage between any two hot lines of a 230 volt grounded delta
power supply - 🧠 ANSWER ✔✔230V
draw a diagram of a 230 volt grounded delta power supply. label all of the
voltages and the wild leg - 🧠 ANSWER ✔✔
what is the wild leg? - 🧠 ANSWER ✔✔leg with higher than 120v to ground
or neutral
what danger is the wild leg? - 🧠 ANSWER ✔✔high voltage that will damage
120v component in the circuit
what is the voltage between either of the non wild leg hot lines and neutral
in a 230 volt grounded delta system? - 🧠 ANSWER ✔✔115v
how do you determine which hot line is the wild leg in a 250 volt grounded
delta power supply? - 🧠 ANSWER ✔✔the one that does not measure 120
volts to neutral or ground
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
4
PRIVACY STATEMENT. ALL RIGHTS RESERVED
Questions and Verified Answers |
Already Graded A+
What do the following prefixes mean? Micro,Kilo,Mega,Milli - 🧠 ANSWER
✔✔1/1,000,000, 1000, 1,000,000, 1/1000
If you know the wattage and voltage, how do you determine the current? - 🧠
ANSWER ✔✔Divide the wattage by the voltage
If you know the voltage and current how do you determine the wattage? - 🧠
ANSWER ✔✔Multiply voltage times current
If a circuit is supplied with 100 volts and the total resistance of the circuit is
200 ohms, how much current will the circuit draw? - 🧠 ANSWER ✔✔.5
amps
If a piece of equipment is supplied 208 volts and the amp meter clamped to
the hot line reads 20 amps, what is the wattage of the load? - 🧠 ANSWER
✔✔4160 Watts
How much voltage is in one hot line? - 🧠 ANSWER ✔✔None
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
1
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,What happens to current in a parallel circuit? - 🧠 ANSWER ✔✔It divides
across resistances
what happens to voltage across the loads in a parallel circuit? - 🧠 ANSWER
✔✔stays the same
what happens to the voltage across the loads in a series circuit? - 🧠
ANSWER ✔✔it divides across the resistances
what happens to the current in a series circuit? - 🧠 ANSWER ✔✔It stays
the same everywhere
in a parallel circuit the total resistance of the circuit will always be less than
what resistance? - 🧠 ANSWER ✔✔the smallest resistance
how do you find the total resistance of a series circuit? - 🧠 ANSWER
✔✔add the resistances together
how do you find the total resistance of a parallel circuit? - 🧠 ANSWER
✔✔1/RT = 1/R1 + 1/R2 + 1/R3 ...
If a circuit is wired parallel, and the supply voltage is 120 volts, each load
must be rated at what voltage? - 🧠 ANSWER ✔✔120 volts
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
2
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,if a circuit has two elements wired in series, and each is rated at 120 volts,
what voltage must be supplied to the circuit in order for the elements to
heat at full power? - 🧠 ANSWER ✔✔240 volts
What is the advantage of using higher voltages? - 🧠 ANSWER ✔✔Lower
Current and wire size
Is there a negative and positive line in AC power supplies? - 🧠 ANSWER
✔✔No
What is the voltage between two hot lines in a 230-volt system? - 🧠
ANSWER ✔✔230V
What is the voltage between two hot lines in a 208-volt system? - 🧠
ANSWER ✔✔208V
What is the voltage between a hot line and a neutral in a 230-volt single
phase supply? - 🧠 ANSWER ✔✔115V
What is the voltage between a hot line and a neutral in a 208-volt single
phase supply? - 🧠 ANSWER ✔✔120V
What is the accepted maximum voltage difference between the name plate
voltage and the supplied voltage? - 🧠 ANSWER ✔✔+ or - 10%
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
3
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, What is the voltage between any two hot lines of a 230 volt delta power
supply? - 🧠 ANSWER ✔✔230V
what is the voltage between a hot line and ground on a 240 volt delta
power supply - 🧠 ANSWER ✔✔No usable voltage
what is the voltage between any two hot lines of a 230 volt grounded delta
power supply - 🧠 ANSWER ✔✔230V
draw a diagram of a 230 volt grounded delta power supply. label all of the
voltages and the wild leg - 🧠 ANSWER ✔✔
what is the wild leg? - 🧠 ANSWER ✔✔leg with higher than 120v to ground
or neutral
what danger is the wild leg? - 🧠 ANSWER ✔✔high voltage that will damage
120v component in the circuit
what is the voltage between either of the non wild leg hot lines and neutral
in a 230 volt grounded delta system? - 🧠 ANSWER ✔✔115v
how do you determine which hot line is the wild leg in a 250 volt grounded
delta power supply? - 🧠 ANSWER ✔✔the one that does not measure 120
volts to neutral or ground
COPYRIGHT©PROFFKERRYMARTIN 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
4
PRIVACY STATEMENT. ALL RIGHTS RESERVED
