Question

1.) A multipurpose transformer has a secondary coil with several points at which a voltage can be extracted, giving outputs of 5.60, 12.0, and 480 V.

(a)

The input voltage is 140 V to a primary coil of 300 turns. What are the numbers of turns in the parts of the secondary used to produce the output voltages?

5.60 V ________turns

12.0 V_________ turns

480 V ________turns

(b)

If the maximum input current is 5.50 A, what are the maximum output currents (in A) (each used alone)?

5.60 V _____A

12.0 V ______A

480 V_______ A

2.)

a) What is the characteristic time constant (in s) of a 22.5 mH inductor that has a resistance of 4.25 Ω?

b)If it is connected to a 12.0 V battery, what is the current (in A) after 12.5 ms? Answer: ______ A

Answer 1

(a) Vb = 140 V N6=300 turns li vp = Np VS 140 5.6 300 NA 2 Ng = (ii) No - 25.71 300 X 12 140 (iii) Nga 300 x 480 140 = (1028.6 =S.SA (6) Ip = lil up Vs Is Тр Is= 5.5x 140 » 5.6 lii) Iz = 5.5x 140 137.5A (64.2/A 12 1.6A (iii) Is=5.5x140 480

(2) (a) Characteristic time = L R = 22.5x10 -3 4.25 0.00529/sec _RAIL - (6) I= VR Cine 11) 12.5x163 5.294103 12 (-e 4.25 :) x 0.90566 - 12 4.25 =(2.56A -

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