Question:
In a step-up transformer the turn ratio is 1:2. A Leclanché cell (emf 1.5 V) is connected across the primary. The voltage across the secondary is:
In a step-up transformer the turn ratio is 1:2. A Leclanché cell (emf 1.5 V) is connected across the primary. The voltage across the secondary is:
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Transformers only work with alternating current (AC), not direct current (DC).
Updated On: Apr 22, 2026
- 3.0 V
- 0.75 V
- zero
- 1.5 V
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The Correct Option is C
Solution and Explanation
Step 1: Recall the transformer equation.
The voltage ratio in a transformer is related to the turn ratio as: \[ \frac{V_1}{V_2} = \frac{N_1}{N_2} \] where \( V_1 \) and \( V_2 \) are the voltages across the primary and secondary coils, respectively, and \( N_1 \) and \( N_2 \) are the number of turns in the primary and secondary coils.
Step 2: Analyze the given information.
For a step-up transformer with a turn ratio of 1:2, the voltage across the secondary should ideally be twice the primary voltage. However, a Leclanché cell has a very low emf of 1.5 V, and transformers do not work efficiently with DC sources, so the secondary voltage is essentially zero.
Step 3: Conclusion.
The voltage across the secondary is zero, which is option (3).
The voltage ratio in a transformer is related to the turn ratio as: \[ \frac{V_1}{V_2} = \frac{N_1}{N_2} \] where \( V_1 \) and \( V_2 \) are the voltages across the primary and secondary coils, respectively, and \( N_1 \) and \( N_2 \) are the number of turns in the primary and secondary coils.
Step 2: Analyze the given information.
For a step-up transformer with a turn ratio of 1:2, the voltage across the secondary should ideally be twice the primary voltage. However, a Leclanché cell has a very low emf of 1.5 V, and transformers do not work efficiently with DC sources, so the secondary voltage is essentially zero.
Step 3: Conclusion.
The voltage across the secondary is zero, which is option (3).
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