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Current

Current is measured in amperes (A) and is abbreviated as I. Current indicates how many electrons are flowing through the wire—in other words, the amount of current. A charger with a higher current will charge a rechargeable flashlight or a smartphone faster than a charger with a lower current. When using fast chargers, the battery must therefore support this feature. The current is calculated by dividing the power by the voltage, that is: amperes = watts/volts. Thus, the current in amperes is directly related to these other two quantities. It must be taken into account to prevent short circuits or the wire from burning out, because the higher the current, the more electricity flows and the hotter the wire becomes. To prevent overheating, however, outlets have a maximum current limit. If this limit is exceeded, the fuse blows to protect us—so the amperage rating of a light fixture must not exceed the amperage limit of the outlet being used.

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