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JEE Main 20241 FebruaryEvening Shift

Exam: JEE Main
Year: 2024
Date: 1 February
Shift: Evening Shift
Subject: Physics
Chapter: Alternating Current

JEE Main 2024 · 1 February · Evening Shift · Physics · Alternating Current

A transformer has an efficiency of 80 % and works at 10V and 4kW ....

A transformer has an efficiency of

80 %

and works at

10V

and

4kW .

If the secondary voltage is

240V,

then the current in the secondary coil is:

Options

A $1 . 59A$
B $13 . 33A$
C $1 . 33A$
D $15 . 1A$

Correct answer

B. $13 . 33A$

Step-by-step solution

Efficiency $η = \dfrac{{P}_{output}}{{P}_{input}} = \dfrac{{E}_{S}{I}_{S}}{{E}_{P}{I}_{P}}$

$⇒ 0 . 8 = \dfrac{240{I}_{S}}{4000}$

$⇒ {I}_{S} = \dfrac{3200}{240} = 13 . 33A$

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