Answer / sirajudheen nellur

Because in AC there is a phenomenon called skin effect, ie
the AC travels only through outer surface of the cable. It
is the same reason why we use stranded wires for AC

Answer / paridhi jain

because it is concentrated at d surface while dc resistance
is distributed uniformly throughout d conductor

Answer / anil nalla

conductor carries more current on its surface in AC...But in
DC ,current is distributed uniformly.

Answer / paridhi jain

because it is concentrated at d surface while dc resistance
is distributed uniformly throughout d conductor

Answer / m.ravi

skin effect and corona losses will more with frequency and
resistance

Answer / nayeem( cuet)

When DC current passes through any conductor,the current
uniformly distributed over the whole surface of the
conductor. But AC current not distributed uniformly rather
it has the tendency to concentrate. this is known as skin
effect. For this reason AC resistance is greater than DC
resistance of a transmission line.

Answer / mohd. kashan wali

AC resistance is greater than DC resistance.
The reason is:-

In AC, Skin effect occurs which means that current tends to flow through the skin of the wire than through the inner core,so net area of current flow in AC tends to reduce.
And Resistance is inverse proportional to Area, and as the net area of current flow decrease, so NET AC RESISTANCE INCREASES.
Now in DC current, there is uniform current flow.So net area of current flow through conductor is greater than AC,
THUS DC RESISTANCE IS LESS THAN AC

Answer / pawan pal

Ac resistance is high than dc.
Due to corona effect and skin effect ,
Frequency, impedance.

Answer / naresh

in case of ac transmission line, the impedance of the line
may be due to positive ,negative &zero sequence
components.whereas in case of dc there will not be any
effect of either of these components on transmission line.

If breaker is undefined position, first step to do.

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