Answer / nithi

Hai vishwa,
you are considering only the resistive load but
actually most of the loads are motor loads(resistive +
inductive).
when you give low voltage to induction motor,the speed
as well as toque are reduced.becoz,torque is directly
proportional to square of the applied voltage.so,the motor
tries to produce the required load torque comparatively at
higher slip for the same load .Thereby,it draws higher
current from the supply. clear..........

Answer / nithi

sorry friends,

The above two answers are correct only for linear loads
(loads which are obeying OHM'S law i.e.V=IR).

But,In general most of the loads are non-linear in nature.
(EX:Induction Motor).
so,current increases both for low voltages & high
voltages which leads to over-heating of the equipment.

Answer / vinod

if resistance is constant then current drops

Answer / m.vishwanath

Since V is directly proportional to I , it is obvious that I
also drops...

Answer / rajesh

see,
consider a resistive circuit ,
when ever voltage is applied, voltage drops at the resistance.
but current flows.........


consider this example,
you are pushing a big block,this pushing force is voltage.
its movement is current as this known to everyone,
what happened to the force you applied?















it has dropped!!!!!!!!!

from :rajeshbeesettty@yahoo.com

Answer / praful nandankar

Yes the above discussion is right.In case of resistive
loads, current have a liear relationship with voltage.As u
know in case of transmission lines if u have to increase
the power,u have to increase the voltage. When voltage is
decreased,current decreases by the relation P=(I^2)R.Hence
the current capacity og transmission line conductors
decreases which is economical for power handling capacity.

Answer / mani777

current will increase friends

Answer / vishu

Yeah u r right.
Thanx Nithi

Answer / m.vishwanath

Nithi current cannot be increase when voltage drops can u
please give me atleast one example where u hav found
increase of current when fall in voltage...

Answer / vishwanath

for futher info:


http://www.engineeringtoolbox.com/electrical-motor-calculator-d_832.html

Regds,

Vishwa
vishwanath_mora@yahoo.co.in
09963666002

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