To obtain lower voltage from a transformer, the secondary coil must be connected in what manner?

To obtain lower voltage from a transformer, the secondary coil must be connected in parallel with a load. This connection method allows the transformer to provide the necessary voltage decrease as it functions based on the turns ratio of the primary and secondary coils. When the secondary coil has fewer turns than the primary coil, this configuration takes advantage of the principles of electromagnetic induction to step down the voltage effectively.

When connected in parallel, the high voltage supply is dropped across the load connected to the secondary side, allowing for a lower voltage output while maintaining the current capacity. This approach is integral in transformer design and utilization, especially for power distribution where specific voltage levels are required for various applications.

Other methods mentioned, such as series connections or an open circuit, would not achieve the desired outcome of reducing voltage; series connections generally increase voltage, while an open circuit would prevent any current flow, thus eliminating voltage output entirely. Therefore, parallel connection is the correct and practical method for achieving a lower voltage from a transformer.