
#1
Mar2206, 07:35 PM

P: 2

i'm a lil confused bout whether we need the voltage and current to be out of phase or its something we just can't avoid..?




#2
Mar2206, 08:04 PM

Sci Advisor
PF Gold
P: 2,631

Well, if I understand what you are asking; The phase shift between the voltage and current waves depends on the load of the system. With lots of motors, for example, you would need to add capacitance to keep the shift to a minimum. A measure of how well power gets transfered is called power factor.
Regards 



#3
Mar2206, 08:08 PM

Emeritus
Sci Advisor
PF Gold
P: 10,424

For purely resistive loads, voltage and current are inphase, and this is the ideal situation. Maximal power transfer to the load occurs in this condition.
In many situations, reactive (i.e. capacitive or inductive) loads are unavoidable, but they are not ideal.  Warren 



#4
Mar2306, 05:36 PM

P: 26

power generation and distribution
Try rephrasing the question.




#5
Mar2406, 02:27 PM

Admin
P: 21,628

As much as possible it is desirable to reduce reactance. One way to reduce reactance in a power line is to add capacitance to offset the inductance. 



#6
Mar2506, 12:11 AM

P: 2

thanks for the help. i started the course with very little basics but i think i'm beginning to get the picture now. so, if there is no inductance (which 'pushes' the current back) both will be in the same phase right? as for passing a capacitor, the current leads the voltage because the charges move 'ahead' once there is sufficient voltage change, am i right?




#7
Mar2606, 07:46 PM

P: 26

Just muddying the water a little 


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