Amprit ruutmeetri kohta, tähis A·m⁻² või A/m², on SI tuletatud ühik elektrivoolu tiheduse mõõtmiseks; see vastab olukorrale, kus üheamprine elektrivool läbib ühtlase ristlõikepindalaga ühe ruutmeetri suurust ala, ning insenerid kasutavad seda ühikut voolutugevuse hindamiseks konkreetses ruumiosas, nt juhtmes või trükkplaadi rajal.
Ampere per square metre, symbol A⋅m-2 or A/m2, is the standard International System of Units (SI) derived unit for electric current density that is one ampere of electric current flowing through a uniform cross-sectional area of one square metre, and engineers use this unit to measure how much electrical current passes through a specific space, such as a wire or a circuit board trace.
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