Alternating Current Ques 38
38. The primary winding of a transformer has $500$ turns whereas its secondary has $5000$ turns. The primary is connected to an $A.C.$ supply of $20$ $ V$, $50$ $ Hz$. The secondary will have an output of
[1997]
(a) $2$ $V, 5 $ $Hz$
(b) $200 $ $V, 500 $ $Hz$
(c) $2$ $ V, 50 $ $Hz$
(d) $200 $ $V, 50 $ $Hz$
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Answer:
Correct Answer: 38.(d)
Solution:
- (d) The transformer converts $A.C.$ high voltage into $A.C$. low voltage, but it does not cause any change in frequency. The formula for voltage is
$\frac{E_s}{E_p}=\frac{N_s}{N_p} \Rightarrow E_s=\frac{N_s}{N_p} \times E_p$
$=\frac{5000}{500} \times 20=200 $ $V$
Thus, output has voltage $200 $ $V$ and frequency $50$ $ Hz$.
BETA
