A model railroad transformer is only 75% efficient. It operates at 500 V and the primary coils has 1000 turns. If it is necessary to run the train at 9.0 V and 4.0 A. Calculate the number of secondary turns and the number the resistance of the primary coil.

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A model railroad transformer is only 75% efficient. It operates at 500 V and the primary coils has
1000 turns. If it is necessary to run the train at 9.0 V and 4.0 A. Calculate the number of secondary
turns and the number the resistance of the primary coil.
Now the output from above transformer is applied to step down transformer (with the same ratio
of turns as first transformer). Suggest what will happen in the secondary coil of the second
transformer if both transformer are:
a. 100% efficient
b. 50% efficient
Explain your answer.
Transcribed Image Text:A model railroad transformer is only 75% efficient. It operates at 500 V and the primary coils has 1000 turns. If it is necessary to run the train at 9.0 V and 4.0 A. Calculate the number of secondary turns and the number the resistance of the primary coil. Now the output from above transformer is applied to step down transformer (with the same ratio of turns as first transformer). Suggest what will happen in the secondary coil of the second transformer if both transformer are: a. 100% efficient b. 50% efficient Explain your answer.
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