NCCER 26201-20 ALTERNATING
CURRENT
An electric current always produces ? - ANS A magnetic field
The number of cycles an alternating electric current undergoes per second is known as ? - ANS
K
Frequency
What is the peak voltage in a circuit with an RMS voltage of 120 VAC ? - ANS 170 VAC
C
Which of the following conditions exist in a circuit of pure resistance ? - ANS The voltage and current
are in phase
24A
LO
In a purely resistive AC circuit where 240v is applied across a 10 ohm resistor, the amperage is ? - ANS
When the current increases in an AC circuit, what role does inductance play ? - ANS It reduces the
YC
current
Which of the following coils is likely to show the lowest inductance? - ANS A coil with a narrow coil
Which of the following conditions exists in a circuit of pure inductance? - ANS The voltage and current
D
are 90 degrees out of phase
Reactance increases with an increase in? - ANS Inductance
U
Capacitance is measured in ? - ANS Farads
ST
The total capacitance of two 15uf capacitors connected in parallel is? - ANS 30uf
The total capacitance of two 15uf capacitors connected in series is? - ANS 15uf
The total capacitance of two 5uf capacitors and on 10uf capacitor in parallel is? - ANS 20uf
The opposition to current flow offered by the capacitance of a circuit is known as ? - ANS Capacitive
resistance
The total opposition to current flow in an AC circuit is known as ? - ANS Impedance
The true power in a circuit with 4A through a 50ohm resistor is ? - ANS 200w
CURRENT
An electric current always produces ? - ANS A magnetic field
The number of cycles an alternating electric current undergoes per second is known as ? - ANS
K
Frequency
What is the peak voltage in a circuit with an RMS voltage of 120 VAC ? - ANS 170 VAC
C
Which of the following conditions exist in a circuit of pure resistance ? - ANS The voltage and current
are in phase
24A
LO
In a purely resistive AC circuit where 240v is applied across a 10 ohm resistor, the amperage is ? - ANS
When the current increases in an AC circuit, what role does inductance play ? - ANS It reduces the
YC
current
Which of the following coils is likely to show the lowest inductance? - ANS A coil with a narrow coil
Which of the following conditions exists in a circuit of pure inductance? - ANS The voltage and current
D
are 90 degrees out of phase
Reactance increases with an increase in? - ANS Inductance
U
Capacitance is measured in ? - ANS Farads
ST
The total capacitance of two 15uf capacitors connected in parallel is? - ANS 30uf
The total capacitance of two 15uf capacitors connected in series is? - ANS 15uf
The total capacitance of two 5uf capacitors and on 10uf capacitor in parallel is? - ANS 20uf
The opposition to current flow offered by the capacitance of a circuit is known as ? - ANS Capacitive
resistance
The total opposition to current flow in an AC circuit is known as ? - ANS Impedance
The true power in a circuit with 4A through a 50ohm resistor is ? - ANS 200w
