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A capital A, the SI unit symbol for the ampere.
Also known as: Amp
The capital letter A is the SI symbol for the ampere, the base unit of electric current. It is capitalised because the unit honours a person — the rule that governs every eponymous unit symbol.
Denotes the ampere, the SI base unit of electric current.
Contexts: Mathematics
Takes a capital first letter under the SI rule for units named after a person, while the unit name itself stays lower case: 13 A of current, one ampere.
Contexts: Mathematics
Is printed on plugs, fuses and circuit breakers to state the current a device draws or a protective device will carry, which is where most readers meet it.
Contexts: Electrical equipment
The capital Latin letter A: two diagonal strokes meeting at a point above, joined partway down by a horizontal crossbar.
Current, potential difference and resistance are the three quantities Ohm's law relates.
Current and potential difference are read together on any electrical rating plate.