Physics · Electronics

Which of the following statements is NOT true about a Direct Current (DC) signal?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1Cells, batteries, and regulated power supplies provide a steady DC that is ideal for electronic circuits.
2A DC voltage maintains a single polarity, being either always negative or always positive.
3A DC voltage changes between both positive and negative values over time.✓
4Pure Direct Current always has a constant value.

Correct answer

A DC voltage changes between both positive and negative values over time.

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