4. ( D) The output voltage (at the terminalsof secondary coil of a 180-W tr seco

Question

4. ( D) The output voltage (at the terminalsof secondary coil of a 180-W tr secondary coil has 80 tur coil is (A) 480 turns, (B) 320 turns, (C) 240 turns, D 160 turns (E) 120 turns, (F) 40 turns, (F) 20 turns. 4 % voltage (at the terminals of secondary coil) of a 180-Wi transformer is 15 V, and the ns. The input current (primary coil) is 6 A. The number of turns for the primary 130-30 golgo) = 160 iS 5. ( How many 3 resistors must be connected in series to wean equivalent resistance to four 36 resistors connected in parallel"(A) (B) 4, (C) 5, (D) 6, (E) 8, F) 12XG) 18.4 % 3 04 .RSk,3 . 3' 6. G) What is the main purpose to step up the voltage during the power transmission? (A) it is to increase the resistance, (B) it is to increase the current, (C) it is to increase magnetic field, D) it is to reduc magnetic field, (E) it is to reduce the resistance, (F) it is to reduce the power,(G) it is to reduce the current (H) it is to scare birds and animals. 4 %

Explanation / Answer

4)

let the input current is Ip

Power = Vs * Is

180 = 15 * Is

Is = 12 A

NOw, let the number of turns in primary is Np

as Np/Ns = Is/Ip

Np/80 = 12/6

Np = 160 turns

the number of turns in Primary is 160 turns

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