What are the SI base units of potential difference (the volt)?
kg m s−2A−1\text{kg m s}^{-2} \text{A}^{-1}kg m s−2A−1
kg m2s−2A−1\text{kg m}^2 \text{s}^{-2} \text{A}^{-1}kg m2s−2A−1
kg m2s−3A−1\text{kg m}^2 \text{s}^{-3} \text{A}^{-1}kg m2s−3A−1
kg m2s−3A−2\text{kg m}^2 \text{s}^{-3} \text{A}^{-2}kg m2s−3A−2
