Mutual induction occurs only with transformers that are supplied with:

Mutual induction is a principle that applies to transformers, which are devices designed to transfer electrical energy between two or more circuits through electromagnetic induction. This process relies on the changing magnetic fields created by alternating current (AC) to induce voltage in nearby coils.

When a transformer is supplied with alternating current, the flow of electricity changes direction periodically, which creates a varying magnetic field. This fluctuating magnetic field is essential for mutual induction, as it allows the energy from the primary coil to induce a voltage in the secondary coil. In contrast, direct current (DC) provides a constant flow of electricity, resulting in a steady magnetic field that does not change over time. Therefore, it does not facilitate mutual induction effectively.

This understanding is crucial in the realm of electrical engineering and medical radiography, as transformers are widely used in equipment that requires voltage adjustments, such as X-ray machines. By utilizing AC, these devices can operate efficiently, ensuring optimal performance for imaging procedures.