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why power factor occur only inductive load not in resistive ?
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Answer Posted / venkatesh a
Because of the inductive property of load connected in
source lagging power factor is created. When voltage is
applied across the load current starts following through
the load. Due to the induction effect current is stored as
magnetic field around the coil (0 to 90 degree). After the
90' voltage instantanous value reduces and the energy
stored in load is starts discharging (90 to 180').
Like this in all part cycle some time difference is
happens. Power= Voltage x current
If we multipling these values with respect to the time we
can understand that.
In Leading power factor voltage is stored in load. When
load is capacitance property. Here all so same charging and
discharging happens in load. And net power across the load
is getting reduced due the time difference.
BUT IN RESISTIVE LOAD, NO CAPACITANCE OR INDUCTIVE
PROPERTY. SO NO CHARGING AND DISCHARGING IN LOAD. SO NO
POWER LOSS. SO VOLTAGE AND CURRENT ALWAYS IN SAME DEGREE
VALUE. SO NO ANGLE DIFFERENCE BETWEEN THE VOLTAGE AND
CURRENT. POWER FACTOR= COS()
()= DIFFERENCE BETWEEN VOLTAGE AND CURRENT
If this angle is 0 means,
Power factor= cos 0'
cos 0'= 1
That means maximum power utilisation.
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