Milady Electrology Practice Exam

Which device changes direct current to alternating current?

Rectifier Transformer Inverter Condenser

Correct Answer:

Inverter

Explanation:

An inverter is the device that converts direct current to alternating current. It does this by rapidly switching the DC source on and off and shaping the result into an alternating waveform, often using filters to produce a smoother sine wave. This capability is what powers most situations where DC from batteries or solar panels must be used by standard AC devices or fed into the electrical grid. A rectifier, by contrast, turns AC into DC. A transformer needs AC to function because it relies on changing magnetic flux to transfer voltage; with DC, there’s no changing flux, so it cannot convert DC to AC. A condenser (capacitor) stores electrical energy and smooths voltages but doesn’t generate an alternating current on its own.

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