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Fields and their consequences (A-level only)

Fields and their consequences (A-level only)

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Question 128

An industrial step-down transformer is used to supply power to a heavy-duty electric arc welder. The primary winding of the transformer has 1200 turns, and the secondary winding has 150 turns.

An alternating root mean square (rms) voltage of 480 V is applied across the primary winding, resulting in an primary rms current of 15.0 A. Under these operating conditions, the transformer has an efficiency of 85%.

What are the rms values of the secondary voltage and the secondary current?

A

Secondary voltage: 60 V60\text{ V}60 V; Secondary current: 102 A102\text{ A}102 A

B

Secondary voltage: 60 V60\text{ V}60 V; Secondary current: 120 A120\text{ A}120 A

C

Secondary voltage: 3840 V3840\text{ V}3840 V; Secondary current: 1.6 A1.6\text{ A}1.6 A

D

Secondary voltage: 60 V60\text{ V}60 V; Secondary current: 12.8 A12.8\text{ A}12.8 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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