CSLB contractor B exam (electri
vg vg vg vg
cal)
1.Electrical Circuit: An vg vg vg
consists of a power source, conduc- tors, and load
vg vg vg vg vg vg vg vg
2.simple curcuit: A vg vg vg
consists of only one energy source, one conductor, and one load.
vg vg vg vg vg vg vg vg vg vg
3.series curcuit: A simple vg vg vg vg
has at least two loads. The current flows along a single path and the
vg vg vg vg vg vg vg vg vg vg vg vg vg vg
components are located one after another along this path
vg vg vg vg vg vg vg vg
4.parallel curcuit: A simple vg , the voltage applied to each vg vg vg vg vg vg vg vg vg
branch is the same vg vg vg
5.direction of current: what do arrows indicatevg vg vg vg vg vg
6.electron flow: Inside a DC power source (such as a battery) the elec
vg vg vg vg vg vg vg vg vg vg vg vg
trons travel from the positive terminal to the negative. Electrons trav
vg vg vg vg vg vg vg vg vg vg
eling outside of the power source (a circuit) electrons travel from the
vg vg vg vg vg vg vg vg vg vg vg v
gnegative to the positive terminal. vg vg vg vg
7.continuity: The continuous effective contact with all parts of an elec
vg vg vg vg vg vg vg vg vg vg
trical circuit to give it a high conductance (low resistance).
vg vg vg vg vg vg vg vg vg
8.direct current and alternating current: What are two types of electric
vg vg vg vg vg vg vg vg vg vg vg
urrent?
9.power source: In any completed circuit, it takes a force to push the
vg vg vg vg vg vg vg vg vg vg vg vg v
gelectrons through the , conductor, and load. The two types of force
vg vg vg vg vg vg vg vg vg vg vg vg
to push the electrons of electric current are direct current (DC) and a
vg vg vg vg vg vg vg vg vg vg vg vg
lternating current(AC). vg
10.load: 1) Power output such as a power plant.
vg vg vg vg vg vg vg vg
(2)A device to which power is delivered.
vg vg vg vg vg vg
(3)The demand upon the operating resource of a system such as
vg vg vg vg vg vg vg vg vg vg vg
a telephone exchange system or circuit of garden lights.
vg vg vg vg vg vg vg vg
11.direct current: The polarity from vg vg vg vg vg
power sources never changes; that is, the current flows out of the ne
vg vg vg vg vg vg vg vg vg vg vg vg
gative terminal of the power source in the same direction
vg vg vg vg vg vg vg vg vg
12.alternating curent: power sources produce a voltage and current th
vg vg vg vg vg vg vg vg vg
at has a constant change in polarity and magnitude at a constant fre
vg vg vg vg vg vg vg vg vg vg vg vg
quency, back and forth in a conductor.
vg vg vg vg vg vg vg
flow is produced by a generator or an alternator.
vg vg vg vg vg vg vg vg
13.frequency: The rate of flow reversal is called vg vg vg vg vg vg vg
14.60 cycles per second (60 Hz): Nearly all AC power systems in U.S.A.
vg vg vg vg vg vg vg vg vg vg vg vg
operate at a frequency of
vg vg vg vg vg
15.AC waveforms: When an alternator produces AC voltage, the voltag
vg vg vg vg vg vg vg vg vg
1vg/
vg19
, CSLB contractor B exam (electri
vg vg vg vg
cal)
e switches polarity over time, but does so in a very particular manner.
vg vg vg vg vg vg vg vg vg vg vg vg
When graphed over time, the "wave" traced by this voltage of altern
vg vg vg vg vg vg vg vg vg vg vg vg
ating polarity from an alternator takes on a distinct shape, known as
vg vg vg vg vg vg vg vg vg vg vg v
a sine wave.
g vg vg
16.conductance: vg
is the property of metal that permits current to flow
vg vg vg vg vg vg vg vg vg
17.1/resistance: =conductance vg
2vg/
vg19
, CSLB contractor B exam (electri
vg vg vg vg
cal)
18.resistance: vg
is the opposite of conductance. It is the property that opposes the flow
vg vg vg vg vg vg vg vg vg vg vg vg
of electric current and the friction opposition to the flow of electrons
vg vg vg vg vg vg vg vg vg vg vg vg
19.impedance: vg
is the total opposition to current flow in an ac circuit,
vg vg vg vg vg vg vg vg vg vg
is measured in ohms
vg vg vg
20.voltage: Electron pressure is called electromotive force. The electro
vg vg vg vg vg vg vg vg
motive force literally means the force that moves electrons. The unit
vg vg vg vg vg vg vg vg vg vg vg
of measure of this force is the
vg vg vg vg vg vg vg
21.current: Free electrons moving in the same direction in a conductor
vg vg vg vg vg vg vg vg vg vg
produce an electrical
vg vg vg vg
sometimes called intensity (I). The rate at which electrons move is m vg vg vg vg vg vg vg vg vg vg vg
easured by the unit called ampere (A). vg vg vg vg vg vg
22.power: is defined as the rate at which work is done vg vg vg vg vg vg vg vg vg vg
23.watt: unit of power vg vg vg
24.I x E (Intensity of current in amps x Electromotive force in volts): for
vg vg vg vg vg vg vg vg vg vg vg vg vg
mula for power vg vg
25.P + E (Power in watts + Electromotive force in volts): amps formula
vg vg vg vg vg vg vg vg vg vg vg vg
26.P + I (Power in watts + Intensity of current in amps): volts formula
vg vg vg vg vg vg vg vg vg vg vg vg vg
27.directly: Current is proportional to voltage? vg vg vg vg vg
28.360 volts: For 208 volts x 1.732, use vg vg vg vg vg vg vg
29.398 volts: For 230 volts x 1.732, use volts vg vg vg vg vg vg vg vg
30.416 volts: For 240 volts x 1.732, use volts vg vg vg vg vg vg vg vg
31.762 volts: For 440 volts x 1.732, use volts vg vg vg vg vg vg vg vg
32.797 volts: For 460 volts x 1.732, use volts vg vg vg vg vg vg vg vg
33.831 volts: For 480 volts x 1.732, use volts vg vg vg vg vg vg vg vg
34.1000n: how do you write 1,000 ohms vg vg vg vg vg vg
35.power factor: Alternating— vg vg
Current circuits develop inductive and capacitive re- vg vg vg vg vg vg
actance, which causes some power to be stored temporarily in the el
vg vg vg vg vg vg vg vg vg vg vg vg
ectromagnetic field of the inductor or in the electrostatic field of the vg vg vg vg vg vg vg vg vg vg vg vg
capacitor.
36.True power (W) / vg vg vg
Apparent Power (VA) Watts / Volt-
vg vg vg vg vg vg
Ampere
esistance (R) / Impedance (Z): 3 formulas for power factor
vg vg vg vg vg vg vg vg vg
3vg/
vg19
vg vg vg vg
cal)
1.Electrical Circuit: An vg vg vg
consists of a power source, conduc- tors, and load
vg vg vg vg vg vg vg vg
2.simple curcuit: A vg vg vg
consists of only one energy source, one conductor, and one load.
vg vg vg vg vg vg vg vg vg vg
3.series curcuit: A simple vg vg vg vg
has at least two loads. The current flows along a single path and the
vg vg vg vg vg vg vg vg vg vg vg vg vg vg
components are located one after another along this path
vg vg vg vg vg vg vg vg
4.parallel curcuit: A simple vg , the voltage applied to each vg vg vg vg vg vg vg vg vg
branch is the same vg vg vg
5.direction of current: what do arrows indicatevg vg vg vg vg vg
6.electron flow: Inside a DC power source (such as a battery) the elec
vg vg vg vg vg vg vg vg vg vg vg vg
trons travel from the positive terminal to the negative. Electrons trav
vg vg vg vg vg vg vg vg vg vg
eling outside of the power source (a circuit) electrons travel from the
vg vg vg vg vg vg vg vg vg vg vg v
gnegative to the positive terminal. vg vg vg vg
7.continuity: The continuous effective contact with all parts of an elec
vg vg vg vg vg vg vg vg vg vg
trical circuit to give it a high conductance (low resistance).
vg vg vg vg vg vg vg vg vg
8.direct current and alternating current: What are two types of electric
vg vg vg vg vg vg vg vg vg vg vg
urrent?
9.power source: In any completed circuit, it takes a force to push the
vg vg vg vg vg vg vg vg vg vg vg vg v
gelectrons through the , conductor, and load. The two types of force
vg vg vg vg vg vg vg vg vg vg vg vg
to push the electrons of electric current are direct current (DC) and a
vg vg vg vg vg vg vg vg vg vg vg vg
lternating current(AC). vg
10.load: 1) Power output such as a power plant.
vg vg vg vg vg vg vg vg
(2)A device to which power is delivered.
vg vg vg vg vg vg
(3)The demand upon the operating resource of a system such as
vg vg vg vg vg vg vg vg vg vg vg
a telephone exchange system or circuit of garden lights.
vg vg vg vg vg vg vg vg
11.direct current: The polarity from vg vg vg vg vg
power sources never changes; that is, the current flows out of the ne
vg vg vg vg vg vg vg vg vg vg vg vg
gative terminal of the power source in the same direction
vg vg vg vg vg vg vg vg vg
12.alternating curent: power sources produce a voltage and current th
vg vg vg vg vg vg vg vg vg
at has a constant change in polarity and magnitude at a constant fre
vg vg vg vg vg vg vg vg vg vg vg vg
quency, back and forth in a conductor.
vg vg vg vg vg vg vg
flow is produced by a generator or an alternator.
vg vg vg vg vg vg vg vg
13.frequency: The rate of flow reversal is called vg vg vg vg vg vg vg
14.60 cycles per second (60 Hz): Nearly all AC power systems in U.S.A.
vg vg vg vg vg vg vg vg vg vg vg vg
operate at a frequency of
vg vg vg vg vg
15.AC waveforms: When an alternator produces AC voltage, the voltag
vg vg vg vg vg vg vg vg vg
1vg/
vg19
, CSLB contractor B exam (electri
vg vg vg vg
cal)
e switches polarity over time, but does so in a very particular manner.
vg vg vg vg vg vg vg vg vg vg vg vg
When graphed over time, the "wave" traced by this voltage of altern
vg vg vg vg vg vg vg vg vg vg vg vg
ating polarity from an alternator takes on a distinct shape, known as
vg vg vg vg vg vg vg vg vg vg vg v
a sine wave.
g vg vg
16.conductance: vg
is the property of metal that permits current to flow
vg vg vg vg vg vg vg vg vg
17.1/resistance: =conductance vg
2vg/
vg19
, CSLB contractor B exam (electri
vg vg vg vg
cal)
18.resistance: vg
is the opposite of conductance. It is the property that opposes the flow
vg vg vg vg vg vg vg vg vg vg vg vg
of electric current and the friction opposition to the flow of electrons
vg vg vg vg vg vg vg vg vg vg vg vg
19.impedance: vg
is the total opposition to current flow in an ac circuit,
vg vg vg vg vg vg vg vg vg vg
is measured in ohms
vg vg vg
20.voltage: Electron pressure is called electromotive force. The electro
vg vg vg vg vg vg vg vg
motive force literally means the force that moves electrons. The unit
vg vg vg vg vg vg vg vg vg vg vg
of measure of this force is the
vg vg vg vg vg vg vg
21.current: Free electrons moving in the same direction in a conductor
vg vg vg vg vg vg vg vg vg vg
produce an electrical
vg vg vg vg
sometimes called intensity (I). The rate at which electrons move is m vg vg vg vg vg vg vg vg vg vg vg
easured by the unit called ampere (A). vg vg vg vg vg vg
22.power: is defined as the rate at which work is done vg vg vg vg vg vg vg vg vg vg
23.watt: unit of power vg vg vg
24.I x E (Intensity of current in amps x Electromotive force in volts): for
vg vg vg vg vg vg vg vg vg vg vg vg vg
mula for power vg vg
25.P + E (Power in watts + Electromotive force in volts): amps formula
vg vg vg vg vg vg vg vg vg vg vg vg
26.P + I (Power in watts + Intensity of current in amps): volts formula
vg vg vg vg vg vg vg vg vg vg vg vg vg
27.directly: Current is proportional to voltage? vg vg vg vg vg
28.360 volts: For 208 volts x 1.732, use vg vg vg vg vg vg vg
29.398 volts: For 230 volts x 1.732, use volts vg vg vg vg vg vg vg vg
30.416 volts: For 240 volts x 1.732, use volts vg vg vg vg vg vg vg vg
31.762 volts: For 440 volts x 1.732, use volts vg vg vg vg vg vg vg vg
32.797 volts: For 460 volts x 1.732, use volts vg vg vg vg vg vg vg vg
33.831 volts: For 480 volts x 1.732, use volts vg vg vg vg vg vg vg vg
34.1000n: how do you write 1,000 ohms vg vg vg vg vg vg
35.power factor: Alternating— vg vg
Current circuits develop inductive and capacitive re- vg vg vg vg vg vg
actance, which causes some power to be stored temporarily in the el
vg vg vg vg vg vg vg vg vg vg vg vg
ectromagnetic field of the inductor or in the electrostatic field of the vg vg vg vg vg vg vg vg vg vg vg vg
capacitor.
36.True power (W) / vg vg vg
Apparent Power (VA) Watts / Volt-
vg vg vg vg vg vg
Ampere
esistance (R) / Impedance (Z): 3 formulas for power factor
vg vg vg vg vg vg vg vg vg
3vg/
vg19
