Which device converts DC to DC?

Which device converts DC to DC?

• A. Rectifier
• B. Inverter
• C. Converter
• D. Transformer

Answer: (C)

A DC-DC converter is the device that takes input direct current and outputs direct current at a different voltage or with different regulation. The key is that the output remains DC, just at the needed level for the load. A rectifier turns AC into DC, so it isn’t DC-DC. An inverter does the opposite of what’s needed here: it converts DC to AC. A transformer changes voltage but only with alternating current; it won’t work with steady DC, so it can’t perform DC-DC conversion. In practice, DC-DC converters include linear regulators for small voltage differences and switching regulators (like buck, boost, or buck-boost) for larger changes, and they’re widely used to power control circuits from a main DC bus or battery system in railway equipment.

A DC-DC converter is the device that takes input direct current and outputs direct current at a different voltage or with different regulation. The key is that the output remains DC, just at the needed level for the load.

A rectifier turns AC into DC, so it isn’t DC-DC. An inverter does the opposite of what’s needed here: it converts DC to AC. A transformer changes voltage but only with alternating current; it won’t work with steady DC, so it can’t perform DC-DC conversion.

In practice, DC-DC converters include linear regulators for small voltage differences and switching regulators (like buck, boost, or buck-boost) for larger changes, and they’re widely used to power control circuits from a main DC bus or battery system in railway equipment.