What configuration achieves a higher voltage rating in a single-phase transformer?

What configuration achieves a higher voltage rating in a single-phase transformer?

• A. Secondary coils are connected in parallel
• B. Secondary coils are connected in series
• C. Secondary coils are connected to ground
• D. Secondary coils are used without connections

Answer: (B)

In a single-phase transformer, connecting the secondary coils in series achieves a higher voltage rating. When coils are connected in series, the voltages across each coil are additive. This means that if each coil has its own voltage rating, the total output voltage from the series combination is the sum of the individual coil voltages. For example, if each secondary coil has a voltage of 10 volts, connecting two coils in series would produce an output voltage of 20 volts. This setup is beneficial when a higher voltage is required from the transformer for applications such as stepping up voltage for transmission or other uses. In contrast, when coils are connected in parallel, the voltage across each coil remains the same as the voltage of a single coil, which does not increase the overall output voltage. Grounding the coils would not contribute to increasing the voltage either, as it typically serves to ensure safety and stability in a system rather than enhance voltage. Using coils without any connections likewise does not serve to increase the voltage rating, as there is no configuration to generate output in that scenario. Thus, connecting the secondary coils in series effectively maximizes the voltage output of the transformer.

In a single-phase transformer, connecting the secondary coils in series achieves a higher voltage rating. When coils are connected in series, the voltages across each coil are additive. This means that if each coil has its own voltage rating, the total output voltage from the series combination is the sum of the individual coil voltages.

For example, if each secondary coil has a voltage of 10 volts, connecting two coils in series would produce an output voltage of 20 volts. This setup is beneficial when a higher voltage is required from the transformer for applications such as stepping up voltage for transmission or other uses.

In contrast, when coils are connected in parallel, the voltage across each coil remains the same as the voltage of a single coil, which does not increase the overall output voltage. Grounding the coils would not contribute to increasing the voltage either, as it typically serves to ensure safety and stability in a system rather than enhance voltage. Using coils without any connections likewise does not serve to increase the voltage rating, as there is no configuration to generate output in that scenario. Thus, connecting the secondary coils in series effectively maximizes the voltage output of the transformer.