Which characteristic is crucial for a transformer used in sensitive electronic equipment?

A transformer used in sensitive electronic equipment must have low losses because this characteristic directly affects the efficiency and performance of the device. Low losses ensure that minimal energy is wasted as heat during the operation of the transformer, which is especially important for sensitive equipment where overheating can lead to damage or affect signal integrity. In applications involving delicate electronics, maintaining precise voltage levels and minimizing noise is essential to avoid interference, making low losses critical for reliability and longevity of the equipment.

High voltage ratings can be necessary for other applications, but they do not inherently ensure better performance in sensitive equipment. High impedance is important for certain types of electrical circuits but does not necessarily relate to the overall efficiency or suitability for delicate electronics. Lastly, large physical size does not contribute to the performance of a transformer in sensitive applications; in fact, compact size is often preferred to conserve space and facilitate integration into smaller devices.