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Electrical Circuit
An _________ ________ consists of a power source, conductors, and load
simple circuit
A ________ ________ consists of only one energy source, one conductor, and one load.
series circuit
A simple ________ ________ has at least two loads. The current flows along a single path and
the components are located one after another along this path
parallel circuit
A simple ________ _______, the voltage applied to each branch is the same
direction of current
what do arrows indicate
electron flow
Inside a DC power source (such as a battery) the electrons travel from the positive terminal to the
negative. Electrons traveling outside of the power source (a circuit) electrons travel from the
negative to the positive terminal.
continuity
The continuous effective contact with all parts of an electrical circuit to give it a high
conductance (low resistance).
direct current and alternating current
What are two types of electric current?
power source
In any completed circuit, it takes a force to push the electrons through the ______ ______,
conductor, and load. The two types of force to push the electrons of electric current are direct
current (DC) and alternating current(AC).
load
1) Power output such as a power plant.
(2) A device to which power is delivered.
, (3) The demand upon the operating resource of a system such as a telephone exchange system or
circuit of garden lights.
direct current
The polarity from _________ ______ power sources never changes; that is, the current flows out
of the negative terminal of the power source in the same direction
alternating current
power sources produce a voltage and current that has a constant change in polarity and
magnitude at a constant frequency, back and forth in a conductor. ________ ________ flow is
produced by a generator or an alternator.
frequency
The rate of flow reversal is called
60 cycles per second (60 Hz)
Nearly all AC power systems in U.S.A. operate at a frequency of
AC waveforms
When an alternator produces AC voltage, the voltage switches polarity over time, but does so in
a very particular manner. When graphed over time, the "wave" traced by this voltage of
alternating polarity from an alternator takes on a distinct shape, known as a sine wave.
conductance
_____________ is the property of metal that permits current to flow
1/resistance
=conductance
resistance
____________ is the opposite of conductance. It is the property that opposes the flow of electric
current and the friction opposition to the flow of electrons
impedance
___________ is the total opposition to current flow in an ac circuit, __________ is measured in
ohms
voltage
Electron pressure is called electromotive force. The electromotive force literally means the force
that moves electrons. The unit of measure of this force is the _________
current