AC is ______ compared to DC.
more versatile and cheaper to produce
Most of the power loss over great distance is from _____ and ______.
heat loss and internal resistance of the source.
P=I2R, Heat loss equals
current squared times resistance
AC generators use physical motion and magnetism to produce
The AC waveform shows magnitude and direction of voltage and current with respect to
Fluctuating DC waveforms follow the same shape as AC waveforms except they never fall below
the horizontal axis.
When an AC waveform goes through 360 degrees, it is said to have completed
AC amplitude equals
Effective values are _____ times peak values.
the relationship between voltage and current.
cycles per second.
The concentration of current flow near the surface of a conductor is called ________ and increases resistance.
the skin effect
An electric current is made up of ______.
many free electrons moving in the same direction
The magnitude of induced EMF is proportional to _____, _____, and ______.
the strength of the magnetic field, length of the conductor, and speed of the cutting action.
The strength and direction of the magnetic field around a conductor through which AC is flowing, depends on the _____ and _____.
magnitude and direction of the current
EMF is determined by ______ and ______.
frequency and amplitude
If a conductor is coiled, a _____ emf is produced.
If Inductance (L) or Capacitance (C) is present in a circuit, current is
Inductors are also called
chokes or coils.
A coil is said to be saturated when
even large changes in current cannot increase flux.
Sometimes dots are used to indicate on transformers
in-phase terminals of the windings.
When secondary current in a transformer is increased,
so does the current in the primary.
When very little current flows in the secondary windings in a transformer, the voltage and current in the primary and secondary are
90 degrees out of phase.
The unit of capacitance is the
The capacitance of a capacitor is determined by _____, _____, and _____.
material of the dielectric, the surface area of the plates, and the distance between the plates.
The voltage applied to a capacitor ____ current by 90 degrees.
In a purely resistive circuit, the power factor equals