Sample 1Medium
An ideal transformer steps 2200 V down to 220 V. When the secondary delivers a current of 10 A to a load, the current in the primary is
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The answer is B.
For an ideal transformer VpIp = VsIs, so Ip = 220 × 10/2200 = 1 A.
- A.
100 A multiplies by the turns ratio; a step-down transformer reduces the primary current.
- C.
10 A ignores that power, not current, is the same on both sides.
- D.
0.1 A divides by the turns ratio twice.
NCERT: Class 12 Physics, Chapter 7, Transformers