1 N=1Kg⋅m/s21 \mathrm{~N}=1 \mathrm{Kg} \cdot \mathrm{m} / \mathrm{s}^{2}1 N=1Kg⋅m/s2
1 J =1 N/s\text {1 J }=1 \mathrm{~N} / \mathrm{s}1 J =1 N/s
1 V=1 J/C1 \mathrm{~V}=1 \mathrm{~J} / \mathrm{C}1 V=1 J/C
30 mA=0.03A30 \mathrm{~mA}=0.03 A30 mA=0.03A
