Question
Asked May 6, 2019
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4. (a 5) Power stations are normally far away from the customers. A transformer is often
used to increase the voltage to a high value. Why do we use the high voltage to transmit
the electricity? (b5) For an ideal transformer, if the number of turns in the primary coil
s 3000 and the voltage is 45 kV, to get 120 V from the secondary coil, how many turns
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4. (a 5) Power stations are normally far away from the customers. A transformer is often used to increase the voltage to a high value. Why do we use the high voltage to transmit the electricity? (b5) For an ideal transformer, if the number of turns in the primary coil s 3000 and the voltage is 45 kV, to get 120 V from the secondary coil, how many turns

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Expert Answer

Step 1

(a)

The primary reason that power is transmitted at high voltage is to increase efficiency, the lower current that accompanies high voltage transmission reduce resistance in the conductors as electricity flows along the cables. High voltage transmission lines are used to transmit electric power over long distance.

Step 2

High voltage transmission minimizes the amount of power lost as electricity flows from one location to other. There is also an economic benefit associated with high voltage transmission.

Step 3

(b)

Write the expression for an id...

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