A transformer with 1000 primary turns and 100 secondary turns is supplied at 220 V. The secondary voltage is
- A. 2200 V
- B. 22 V
- C. 220 V
- D. 2.2 V
Explanation
The turns ratio is 10 to 1 down, so the voltage falls by the same factor, from 220 V to 22 V. If the transformer is ideal the secondary current is ten times the primary current, keeping the power the same on both sides. Multiplying instead of dividing gives the 2200 V distractor.