Which notation is preferred in English (dc vs DC -- Upper case vs. Lower case)?

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Ian Kennedy

Use uppercase. They are acronyms.

Pham Quoc Thai

I agree with Prof. Ian Kennedy about using Uppercase form (DC, AC, ...).

Like TGV in France.

Presentacion Rivera-Reyes

According to the IEEE, it must be "ac" and "dc". These terms and the "rms" term are notable exceptions to the rule of abbreviations of technical terms must be capitalized. However, you need to know your audience in terms of at the end, which notation you will use.