| Directions: In the following questions, a statement of Assertion [A] is followed by a statement of Reason (R). |
| Mark the correct choice as: |
| Assertion [A]: Step-down transformer increases the current. |
| Reason (R): Transformer obeys the law of conservation of energy. |
A) Both Assertion [A] and Reason (R) are true and Reason (R) is the correct explanation of Assertion [A]
B) Both Assertion [A] and Reason (R) are true but Reason (R) is not the correct explanation of Assertion [A]
C) Assertion [A] is true but Reason (R) is false
D) Assertion [A] is false and Reason (R) is also false
Correct Answer: B
Solution :
(b) If there is no loss of energy in transformer, then instantaneous output power is equal to instantaneous input power. From this we get \[\frac{{{e}_{S}}}{{{e}_{P}}}=\frac{{{l}_{P}}}{{{i}_{S}}}\]. So in step up transformer voltage increases by decreasing the current. Similarly, step-down transformer decreases the voltage by increasing current. Therefore transformer simply transforms the voltage and current, obeying the law of conservation of energy.
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