Question 471Electricity & Electronics - Assistant Engineer

The correct answer is A. The greatest change in voltage level in the 24 VDC power supply circuit illustrated in EL-0085 takes place in section A, which is the transformer. When the 120 VAC ship's power is fed into the circuit, the transformer steps down the voltage from 120 VAC to the appropriate level for the 24 VDC power supply. This is the section where the largest voltage transformation occurs, making it the correct answer. The other options (B, C, and D) are incorrect because they represent other components in the power supply circuit, such as the rectifier, filter, and regulator, which do not experience the same degree of voltage change as the transformer.