A common transistor radio set requires 12 V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard dom…

Question

A common transistor radio set requires 12 V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of secondary coil are 24, then the number of turns of primary are ____.

Accepted Answer

Correct answer: 440. (440) Given Primary voltage, V_p=220V Secondary voltage, v_s=12V No. of turns in secondary coil is N_s=24 No. of turns in primary coil, N_p= ? We know that for a transformer ⇒ N_pN_s= V_pV_s ⇒N_p= V_p N_sV_s= 220 2412 ⇒N_p=440

Solution

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