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Statement (A): In a step up transformer primary is made of thick insulated copper wire and the secondary is made of thin wire.
Statement (B) : A step up transformer converts large current at low voltage to a low current at high voltage.

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A is true, B is false

Both A and B are true

A is false , B is true

Both A and B are false

answer is B.

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Detailed Solution

Assuming a 100% efficient transformer, $V_{P} I_{P} = V_{S} I_{S}$ .

For step-up transformer, $V_{S} > V_{P} \Rightarrow I_{P} > I_{S}$ .

Copper loss = $I^{2} R a n d R \propto \frac{1}{A} .$

To reduce the copper loss , the primary is made of thick insulated wire and the secondary is made of thinner wire.

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