Asked in Uncategorized
Is the inner core solid'liquid'or gaswhat keeps it in this phase?
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Asked in Microbiology, Cell Biology (cytology)
What happens at the cristae inner membranes in the mitochondria?
Asked in Plate Tectonics
Why is the inner core of the earth solid even though its so hot?
Asked in Physics, Chemistry, Elements and Compounds
Why most chemical reactions are performed in a liquid solution rather than in the solid or gas phase?
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 Geophysics
What is inner core solid liquid or gas what makes it phase?
Asked in Genetics
Where do the second and third phase of cell respiration occur?
Why do doctors give an hcg injection after embryo transfer?
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.
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.
Phase to phase clearance in 11000 electrical circuit?
Asked in Swine Flu (H1N1/09)
Is Swine Flu in minnesota?
Asked in Biology, Genetics, Biochemistry
Is the mitochondrion surrounded by a membrane?
Why do you have voltage to ground but not voltage phase to phase?
Asked in Home Electricity, Electrical Engineering
What are the three types of phase on its final phase?
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.
Where does each stage of cellular respiration takes place?
Asked in England, Landmarks and Monuments, Stonehenge
Is Stonehenge 1 the inner part of the whole of Stonehenge?