What is the result of voltage induced in a transformer's secondary winding?

The result of voltage induced in a transformer's secondary winding relies on the magnetic coupling between the primary and secondary windings. This principle is based on electromagnetic induction, where a changing magnetic field created by the alternating current in the primary winding induces a voltage in the secondary winding. The strength of this induced voltage is directly proportional to the rate of change of the magnetic flux and the number of turns in the secondary winding. This intimate coupling between the two windings allows for efficient energy transfer from the primary to the secondary, enabling the transformer to step up or step down voltages as required.

Other options, while related to electrical concepts, do not accurately describe the primary mechanism behind voltage induction in transformers. The physical motion is more relevant in applications like generators rather than transformers, and the relationship between input power and induced voltage is not direct, as transformers can operate with different loads and efficiencies. As for the voltage relationship, the induced voltage in the secondary winding can either be higher or lower than that of the primary, depending on the turns ratio, not inherently lower. Therefore, it's the magnetic coupling that fundamentally dictates the induced voltage in a transformer's secondary winding.