A step down transformer is used to reduce the main supply from ' V₁ ' volt to ' V₂ ' volt. The primary coil draws a current ' I₁ ' A and the secondary coil draws ' I₂ ' A. (I₁ < I₂). The ratio of input power to output power is (a) (V₁V₂)/(I₁I₂) (b) (V₁I₁)/(V₂I₂) (c) (I₁I₂)/(V₁V₂) (d) (V₁I₂)/(V₂I₁)

Answer: (b). Input power = V₁I₁, output power = V₂I₂. Ratio = (V₁I₁)/(V₂I₂) So the answer is (b) (V₁I₁)/(V₂I₂).

A step down transformer is used to reduce the main supply from ' V₁ '… | MHT CET 2021 (22 Sep, Shift 2)

Q43MHT CET 2021 · 22 SEP · SHIFT 2Medium

AC Generator & Transformer

A step down transformer is used to reduce the main supply from ' $V_1$ ' volt to ' $V_2$ ' volt. The primary coil draws a current ' $I_1$ ' $\text{A}$ and the secondary coil draws ' $I_2$ ' A. $(I_1 < I_2)$ . The ratio of input power to output power is

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Answer: (b)

Input power $= V_1I_1$ , output power $= V_2I_2$ .
Ratio $= \dfrac{V_1I_1}{V_2I_2}$
So the answer is (b) $\dfrac{V_1I_1}{V_2I_2}$ .

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