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The most common symbol used for DC voltage is two, short, parallel horizontal lines, only the bottom one is dashed. Click here for an image: http://upload.wikimedia.org/wikipedia/commons/9/9f/Direct_current_symbol.svg

Answer

The ISO recommends lower case letters as follows: d.c., except where it is used at the start of a sentence, where it should be capitalised: D.C. For example:

  • "A voltage of 12 V d.c."
  • "D.C. voltages are supplied by batteries."
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