Which device converts vehicle DC power to alternating current?

• A. Inverter
• B. Condenser
• C. Rectifier
• D. Alternator

Answer: (A)

Converting DC power from a vehicle battery into usable alternating current requires an inverter. An inverter takes the direct current from the battery and uses electronic switching to create an alternating current at the desired voltage and frequency, so you can run AC-powered tools, laptops, or other devices from a car’s 12‑V (or 24‑V) system.

A rectifier, by contrast, does the reverse: it turns AC into DC, which is why it’s used to charge the battery and power DC loads—not to supply AC equipment. The alternator generates AC while the engine runs, but its main job is to produce electric power that is then rectified to DC for the vehicle’s electrical system, so it’s not a DC-to-AC converter. A condenser (capacitor) stores and smooths electrical energy but does not switch DC into AC.

So, for turning vehicle DC into AC, the device you need is an inverter.