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प्रश्न
A step-down transformer reduces the supply voltage from 220 V to 11 V and increase the current from 6 A to 100 A. Then its efficiency is
विकल्प
1.2
0.83
0.12
0.9
उत्तर
0.83
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संबंधित प्रश्न
The secondary windings of a transformer in which the voltage is stepped down are usually made of thicker wire than the primary. Explain why.
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A transformer works on the principle of ______.
The primary coil of a transformer has 800 turns and the secondary coil has 8 turns. It is connected to a 220 V ac supply. What will be the output voltage?
The line that draws power supply to your house from street has ______.
- zero average current.
- 220 V average voltage.
- voltage and current out of phase by 90°.
- voltage and current possibly differing in phase `phi` such that `|phi| < pi/2`.
