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Fields and their consequences (A-level only)

Fields and their consequences (A-level only)

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Question 73

An industrial step-down transformer is used to reduce the voltage from an 11 kV11\text{ kV}11 kV rms transmission line to a 230 V rms supply for a factory. When operating under full load, the transformer delivers a current of 480 A rms to the factory.

The transformer has an efficiency of 96%.

What is the rms current in the primary coil under these conditions?

A

9.64 A9.64\text{ A}9.64 A

B

10.0 A10.0\text{ A}10.0 A

C

10.5 A10.5\text{ A}10.5 A

D

10.9 A10.9\text{ A}10.9 A

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Fields and their consequences (A-level only) Questions

  1. A Level
  2. /Physics
  3. /Fields and their consequences (A-level only)

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