###### Asked in Uncategorized

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# Is the inner core solid'liquid'or gaswhat keeps it in this phase?

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## Related Questions

###### Asked in Home Electricity, Electrical Engineering, Electrical Wiring

### Why is line voltage 1.732 times phase voltage?

Line voltage is stated as "phase to phase". Phase voltage is
stated as "phase to ground".
In a three phase system, each phase is 120 degrees out of phase
with respect to the other two, one leading, and the other
trailing.
Draw the vector diagram for this and you get three triangles
inside a larger triangle, the outer sides being phase to phase and
the inner sides being phase to ground. The outer triangle is
equilateral, with angles of 60 degrees, and the inner triangles are
isosceles with angles at the outer triangle's vertices of 30
degrees.
Look at one of the inner triangles and bisect it with a vector
from ground perpendicular to the vector for phase to phase. You see
a right triangle. Now you can do trigonometry...
The base is one half the phase to phase voltage. Lets call that
X. In trig, cosine(theta) = X (one half phase to phase) over
hypotenuse (phase to ground). Cosine 30 is 0.866, so phase to
ground is one half phase to phase over 0.866, or phase to phase
over 1.732.
A typical US distribution system has a three phase power at
13.2kv, phase to phase. We make that, simply, 13.2. If you measure
phase to ground while the system is in relatively good balance,
which it is most of the time, you get 7.62kv. We call that 7620.
This is in the ratio of 1.732.
Addition: It's also just the square root of 3.
Comment">Comment
The three 'hot' conductors that supply a three-phase load are
called 'line conductors', which is why the voltage between
any pair is called a 'line voltage'. There is simply no such
thing as a 'phase-to-phase voltage' or a 'phase-to-ground'
voltage!
In a three-phase, four-wire, system, a 'phase voltage' is
measured between any line conductor and the neutral conductor. In
this case, the line voltage is 1.732 times the phase voltage.
In a three-phase, three-wire, system, a 'phase voltage'
is measured between any pair of line conductors (there is no
neutral conductor), because it is numerically-equal to the line
voltage.

###### Asked in Planetary Science, Planet Venus

### Is the Sun pulling Venus closer to the Sun?

Yes but Venus' momentum keeps it (almost) in the same orbit year
after year. Eventually either Venus will be pulled into the Sun or
the Sun will expand (nothing to do with Venus gravity or orbit,
just a phase of the Sun's development) and encompass Venus (and
Mercury as well as Earth) obliterating the inner planets.

###### Asked in Home Electricity, Electrical Engineering, Electrical Wiring

### Does a single phase motor heat up more than a three phase motor?

No, the motor manufacturer maintains a specific temperature
range for motors to operate in. It is usually 40 degrees C. The
frame design and cooling fan on the motor shaft keeps the motor
operating at a temperature within the manufactures specifications.
This is regardless of whether the motor is single phase or three
phase.

###### Asked in Home Electricity, Electrical Engineering, Electrical Wiring

### What is the phase to phase voltage on a 208 3 phase panel?

Phase to phase voltage on a 3 phase 208 volt panel is 208 volts.
From each of the three phase legs to the starpoint neutral the
voltage is 120 volts.
Correction to the above answer. phse to phase means the
line to line voltage. phase voltage is another thing. phase to
phase voltage is equal to root 3 times phase voltage.
PHASE TO PHASE V = 1.73 * PHASE V
The correct term is 'line-to-line' voltage, not
'phase-to-phase'. Unfortunately, the term 'phase-to-phase' is often
used in the field but, technically, it is incorrect.

###### Asked in Electrical Engineering

### What are the internal parts of a three phase alternator?

The outer, stationary, part which supports the armature windings
(the windings into which the three-phase voltages are induced), is
called the 'stator'. The inner, rotating part, which
supports the field windings, is called the 'rotor'. The
field windings are supplied with a d.c. voltage, via a
commutator and brushes.

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