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Question
Read the following paragraph and answer the question:
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, ______.
Options
the voltage is stepped-up (Vs >Vp ) and arrangement is called a step-up transformer.
the voltage is stepped-down (Vs <Vp ) and arrangement is called a step- down transformer.
the current is stepped-up (Is >Ip ) and arrangement is called a step-up transformer.
the current is stepped-down (Is <Ip ) and arrangement is called a step- down transformer.
Solution
If the secondary coil has a greater number of turns than the primary, the voltage is stepped-up (Vs >Vp ) and arrangement is called a step-up transformer.
Explanation:
i.e. `"N"_"s"/"N"_"p" = "E"_"s"/"E"_"p"`
