A step-up transformer operates on a 230V line and supplies a load of 2 ampere. The ratio of the primary and secondary windings is 1:25. The current in the primary is

Question

A step-up transformer operates on a 230V line and supplies a load of 2 ampere. The ratio of the primary and secondary windings is 1:25. The current in the primary is (A) 15A (B) 50A (C) 25A (D) 12.5A

Tardigrade Admin · Accepted Answer

(EP/Es)=(NP/Ns)=(1/25);Es=5750V (EP/Es)=(NP/Ns)=(1/25);Es=5750V IP=(PP/VP)=(PS/VP)=(2 × 5750/230)=50A

Q. A step-up transformer operates on a $230 V$ line and supplies a load of $2$ ampere. The ratio of the primary and secondary windings is $1 : 25.$ The current in the primary is

$15 A$

$50 A$

$25 A$

$12.5 A$

$\frac{E _{P}}{E _{s}} = \frac{N _{P}}{N _{s}} = \frac{1}{25}; E_{s} = 5750 V$
$\frac{E _{P}}{E _{s}} = \frac{N _{P}}{N _{s}} = \frac{1}{25}; E_{s} = 5750 V$
$I_{P} = \frac{P _{P}}{V _{P}} = \frac{P _{S}}{V _{P}} = \frac{2 \times 5750}{230} = 50 A$

Q. A step-up transformer operates on a 230V line and supplies a load of 2 ampere. The ratio of the primary and secondary windings is 1:25. The current in the primary is

15A

50A

25A

12.5A