can anyone help me in these questions !! I donot know how get them !! The primar
ID: 2075099 • Letter: C
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can anyone help me in these questions !! I donot know how get them !!
The primary coil of a transformer has N_p = 250 turns, and its secondary coil has N_s = 1500 turns. If the RMS voltage across the secondary coil is V_RMS = 120V, what RMS voltage is across the primary coil? A) 720 V (B) 120 V (C) 60 V (D) 20 V (E) 5 V A transformer is to be used to provide power for a computer disk drive that needs 6.0 V_RMS instead of 120 V_RMS from the wall outlet. If the number of turns in the primary coil is 500, what is the number of turns in the secondary coil? (A) 10000 (B) 500 (C) 120 (D) 25 (E) 20 Examine the number of turns in primary and secondary coils of the transformer shown in Figure 14. How this transformer should be referred to? (A) As a step-up transformer (B) As a step-down transformer (C) As a step-to the left transformer (D) As a step-back transformer Assuming that a transformer shown in Figure 14 is an ideal transformer, what statement about this transformer from the following statements is correct? (A) The voltage in the primary coil is smaller than the voltage in secondary coil. (B) The current in the primary coil is greater than the current in secondary coil. (C) The power input of the primary coil is smaller than the power output of the secondary coil. (D) The power input of the primary coil equals the power output of the secondary coil. The MAX input voltage of a transformer shown in Figure 14 is 18V and it has 8 turns in the primary coil. What is the MAX voltage developed in the secondary coil of this transformer? (A) 144 V (B) 36 V (C) 18 V (D) 9 V (E) 3 VExplanation / Answer
1) N1 / N2 = V1 / V2
V1 = N1 * V2 / N2
= (120 * 250) / 1500
= 20 V [option D]
2) Number of turns in secondary Ns = Np * [delta V2 / delta V1]
= 500 * [6 / 120]
= 25 turns [option D]
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