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Figure : Long distance power transmissio...


Figure : Long distance power transmissions The large-scale transmission and distribution of electrical energy over long distances is done with the use of transformers. The voltage output of the generator is stepped-up. It is then transmitted over long distances to an area sub station near the consumers. There the voltage is stepped down. It is further stepped down at distributing sub-stations and utility poles before a power supply of 240 V reaches our homes.
If the secondary coil has a greater number of turns than the primary,

A

The voltage is stepped-up `(V_(s) gtV_(p))` and arrangement is called a step-up transformer

B

the voltage is stepped-down `(V_(s) lt V_(p))` and arrangement is called a step down transformer

C

the voltage is stepped-down `(I_(s) gt I_(p))` and arrangement is called a step down transformer

D

the voltage is stepped-down `(I_(s) lt I_(p))` and arrangement is called a step down transformer

Text Solution

Verified by Experts

The correct Answer is:
A
In a transformer
`rArr epsi_(p)=N_(P)=(dphi_(2))/(dt)`
`rArr N_(s)=(dphi_(s))/(dt)=epsi_(s)`
`rArr (epsi_(p))/(epsi_(s))=(N_(p))/(N_(e))`
Since `N_(s) gt N_(p)`
`:. epsi_(s) epsi_(p)` hence, it is a step up transformer.
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