NCCER Electrical 26103-17 Introduction to
Electrical Circuits
A circuit has a source voltage of 50V and a current of 10A. What is the power in
watts? P=!xE - ANSWER-500
Is the force that causes electrons to flow - ANSWER-Voltage
If a circuit has 12 amps of current and the resistance is 20 ohms, the applied
voltage is : (E=IR) - ANSWER-240 V
If two 10 ohm resistors are connected in series, what is the total resistance of these
resistors? R1+R2=RT - ANSWER-20 ohms
To make sure the voltage is turned off before touching any terminals, use a(n)
_____. - ANSWER-Voltage tester
How many amps are there in the current of a circuit if the voltage source is 140V
and the resistance is 2 ohms? (I=V/R) - ANSWER-70 amps
Materials with electrical characteristics that fall between those of insulators and
conductors are considered _____. - ANSWER-Semiconductors
What is the applied voltage if the current in a circuit is 60 amps and the resistance
is 10 ohms? (E=IR) - ANSWER-600 volts
Which of the following is used to step voltage down to lower levels before it reaches
a home
or office? - ANSWER-transformer
A 5-ohm and a 20-ohm resistor are connected in parallel. What is the total
resistance of these two resistors?
(R1xR2)/(R1+R2) - ANSWER-4 ohms
If the resistance of a circuit is 25 ohms and the current is 10 amps, the power in
watts is _____. P = I² x R - ANSWER-2500
If a circuit has 48 amps of current and an applied voltage of 240 volts, the
resistance is (R=E/I) - ANSWER-5 ohms
You would measure resistance with a(n) _____. - ANSWER-Ohmmeter
In a parallel circuit, the voltage drop is - ANSWER-the same across all loads
Electrical Circuits
A circuit has a source voltage of 50V and a current of 10A. What is the power in
watts? P=!xE - ANSWER-500
Is the force that causes electrons to flow - ANSWER-Voltage
If a circuit has 12 amps of current and the resistance is 20 ohms, the applied
voltage is : (E=IR) - ANSWER-240 V
If two 10 ohm resistors are connected in series, what is the total resistance of these
resistors? R1+R2=RT - ANSWER-20 ohms
To make sure the voltage is turned off before touching any terminals, use a(n)
_____. - ANSWER-Voltage tester
How many amps are there in the current of a circuit if the voltage source is 140V
and the resistance is 2 ohms? (I=V/R) - ANSWER-70 amps
Materials with electrical characteristics that fall between those of insulators and
conductors are considered _____. - ANSWER-Semiconductors
What is the applied voltage if the current in a circuit is 60 amps and the resistance
is 10 ohms? (E=IR) - ANSWER-600 volts
Which of the following is used to step voltage down to lower levels before it reaches
a home
or office? - ANSWER-transformer
A 5-ohm and a 20-ohm resistor are connected in parallel. What is the total
resistance of these two resistors?
(R1xR2)/(R1+R2) - ANSWER-4 ohms
If the resistance of a circuit is 25 ohms and the current is 10 amps, the power in
watts is _____. P = I² x R - ANSWER-2500
If a circuit has 48 amps of current and an applied voltage of 240 volts, the
resistance is (R=E/I) - ANSWER-5 ohms
You would measure resistance with a(n) _____. - ANSWER-Ohmmeter
In a parallel circuit, the voltage drop is - ANSWER-the same across all loads
