Physics
A student in a laboratory wants to light a bulb of 6 W, 11 V rating with a supply of 220 V. Mention the kind of transformer he should use. Also, calculate the turn ratio for the transformer recommended by you.
Electro-Magnetism
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Answer
Since the supply voltage (220 V) is much higher than the required voltage (11 V), the student needs a step down transformer to reduce the voltage.
Given,
Ep = 220 V
Es = 11 V
Let number of turns at primary coil be Np and at secondary be Ns respectively.
Now,
Turn Ratio =
Hence, recommended turn ratio should be
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