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Question

Why alternating current doesn't allow much loss of energy as compared to direct current


Solution

AC can be stepped up and down in voltage very easily by transformers

 and the bigger the voltage the lesser the current. You tend to get less losses

to resistance when distributing AC over long distances too. You can use

thinner wires which mean they’re cheaper to make and suspend.

we know 

P = VI  ------(i)

using ohm's law 

V = IR ----(ii)

from both the equation (i) and (ii)

 P = I^2*R   (R = total resistance very high value )

when current is very high and  -----> high power loss 

so in AC using transformers we convert the power supply as high voltage low current 

which reduce power loss


also  P= V^2 / R  from (i) and (ii)

as R (total resistace ) is very large  power loss will be less 


 

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