CFESA ELECTRICAL PRACTICE
TEST (LATEST TEST 2025) | ALL
QUESTIONS AND CORRECT
ANSWERS | NEWEST EXAM |
GRADED A+ | VERIFIED
ANSWERS | JUST RELEASED
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
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 1
,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
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
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 2
,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
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 © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 3
, 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
what danger is there when replacing a three phase circuit breaker in a 230 volt
grounded delta power supply? - ANSWER✔✔-crossing the hot lines and supplying the
wild leg to the wrong terminal in the unit.
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 4
TEST (LATEST TEST 2025) | ALL
QUESTIONS AND CORRECT
ANSWERS | NEWEST EXAM |
GRADED A+ | VERIFIED
ANSWERS | JUST RELEASED
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
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 1
,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
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
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 2
,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
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 © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 3
, 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
what danger is there when replacing a three phase circuit breaker in a 230 volt
grounded delta power supply? - ANSWER✔✔-crossing the hot lines and supplying the
wild leg to the wrong terminal in the unit.
COPYRIGHT © 2025 BY OLIVIA GREENWAYS, ALL RIGHTS RESERVED 4
