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ICSE Class 10 Physics Question 7 of 20

Electro-magnetism — Question 12

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Question

Question 12

A step up transformer ............... the current whereas a step down transformer ............... the current.

  1. increases, increases
  2. decreases, decreases
  3. decreases, increases
  4. increases, decreases
Answer

decreases, increases

Reason — In a step up transformer the number of turns in the secondary coil is more than the number of turns in the primary coil ( Ns > Np) i.e., turns ratio n > 1. It increases the a.c. voltage and decreases the current. i.e., Es > Ep and Is < Ip.

In a step down transformer the number of turns in the secondary coil is less than the number of turns in the primary coil ( Ns < Np) i.e., turns ratio n < 1. It decreases the a.c. voltage and increases the current. i.e., Es < Ep and Is > Ip.