Answer :
Final answer:
Buck-boost transformers connected in boost mode increase the input voltage by having additive primary and secondary voltages. In step-up transformers, secondary voltage is higher due to more windings, while step-down transformers have a lower secondary voltage with lesser windings.Therefore the correct option is D.
Explanation:
When buck-boost transformers are connected to boost the input voltage, the primary and secondary voltages are additive. This means that in a boost configuration, the transformer increases the voltage; the secondary voltage adds to the primary voltage, resulting in a higher output voltage.
In a step-up transformer, the number of windings in the secondary coil is greater than the number of windings in the primary coil, which causes the secondary voltage to be greater than the primary voltage. Conversely, a step-down transformer has fewer windings in the secondary coil than the primary coil, resulting in a secondary voltage that is less than the primary voltage. These principles help determine the overall voltage transformation effect of the transformer.
Additionally, transformer efficiency is very high, often exceeding 99%, implying that the electrical power output (Ps) equals the electrical power input (Pp), where P = IV (Power = Current × Voltage).
