# Search results

1. ### Phasor Leading and Lagging Angles

Consider two voltage phasors: V1 = 1 volt @ 50°, and V2 = 1 volt @ 30°. It follows then that the relative phase shift between these two phasors can be expressed by any of the four following descriptions in terms of leading and lagging angle relationships. 1.) V1 Leads V2 by 20° 2.)...
2. ### Dielectric Polarization Components in Ideal RC and C circuits

Hi, I would like to know what the theoretical implication is, as it pertains to RC circuits of the following hypothetical situation(s): If one were to connected an ideal discharged capacitor in parallel with an ideal voltage source with zero resistance in the loop, the calculated RC time...
3. ### Voltage Vector/Scalar Components, SI Units, Direction and Polarity.

All, please help me refine, restate, explain, understand, expand, add, remove, answer the below statements/ questions. Thanks in advance. 1.) Voltage is considered a scalar quantity. (J/C in SI Derived Units) which is a magnitude of energy per coulomb...no direction with this example. Some...
4. ### Inductor coil

Is it true that when a lower voltage is applied across an inductor it burns up the coil? If so can someone please explain why?
5. ### Power Factor

Why is it that the utility will penalize a customer for a low power factor. I cant imagine why they would penalize you if a purely reactive load puts all its power back into the mains.
6. ### 460v/480v Code

Is it against code in any way to have a 460v motor connected to a 480v supply voltage? What problems can be encountered when doing this? Thanx
7. ### VFDs and Motor Configuration

Can someone please give me some general rules of thumb in dealing with VFDs and 3 phase dual wye motor winding configurations. I would like to know when you would wire the motor up for a low voltage or high voltage application when using it with a VFD,under what conditions, and why. Thanx
8. ### Phase to Phase fault?

In a 480v Three Phase Induction Motor.....what kind of educated guess or assumption can be made as a cause, when two of the three fuses blow? Is there any type of significance in two fuses blowing instead of just one in a three phase motor circuit? If only one fuse blew it basically would...
9. ### Step Up Transformer

It is understood that you cannot have something from nothing, but how is this the case with a step up transformer? It seems that stepping up the voltage is stepping up the potential energy and since more windings actually increase the resistance there will be lower current which is how most...
10. ### IEC Contactors

Can someone explain to me what a 3 phase IEC Contactor/starter is, how it works, and what its used for? Thanks
11. ### Current Inrush

When you have a current inrush from turning on a devise, does that mean there is actually less resistance for that brief amount of time?
12. ### Voltage Drops across Resistive Elements

I have been having a very difficult time grasping the concept of voltage drops across resistive elements. In a series configuration....How is it that the greater the value of the resistor, the greater the voltage drop across that resistor? Why does voltage distribute itself that way, in...
13. ### EE Lingo

Has anyone read a book that they would highly recommend for expanding ones Electrical/Mechanical Engineering vocab/ lingo?
14. ### Capacitive Catastrophe

Perhaps some one can explain to me what is meant by "current leads the voltage by 90 degrees"...let this inquiry be in regards to a purely capacitive circuit. What seems to baffle me is why this terminology is used. Its not like the current just decided to occur before a potenial difference.
15. ### Help Voltage drop is driving me insane

Help!!!!! Voltage drop is driving me insane!!!! 1. If the Voltage Drop across a load increases due to its added resistance, what happens to the voltage drop across other segments on the circuit? 2 Why does resistance decrease Voltage (create voltage drop) if the Voltage is a Force "APPLIED"...
16. ### [Ground Ed vs. Ground Ing ]

[Ground"Ed" vs. Ground"Ing"] Why does the ground"Ing" wire in a circuit draw high amounts of current and trips the breaker when a ground"Ed" (neutral) wire does not?
17. ### Hz of 2 Legs

How does a DMM read the Hz of two hot legs, like in a 240v recep? It looks like it only reads one phase
18. ### Polyphase Systems

Is the neutral on a three phase system the same exact neutral on a single phase system? What is the funtion of this neutral if its potential is always zero (the sum of its phasors)? Does it carry any current? I would imagin that it does...but only back to the generator.
19. ### The Carrier of an Emf

The Carrier of an Emf is in many definite/indefinite parts the net of the circuits Total Resistance (Rt). These definite/Indefinite parts are the SMALLEST degree expressed to that of a single atom, the basic Resistive properties or qualities of Itself, and the electron structure as pertaining to...
20. ### DC circuits

Pertaining to DC circuits: a. What Phisically happens in Voltage Drop? b. What exactly do electrons resist against in a conductor? c. With batteries connected in series, why does Voltage phisically add up? d. With batteries connected in parallel, why does current physically add up...
21. ### Voltage/Battery Terminal confusion

1.) Why can't you measure the potential difference across two batteries terminals, lets say a positive terminal from battery A and a negative terminal from battery B? Theoredically there is still a potential difference....therefore voltage.....right????