Potential energy is the potential to do work.
Energy is measured in Joules.
Power is measured in Watts.
1 C (coulomb, 庫倫)
電流單位 A(Ampere, 安培)
1 ampere=1 coulomb of charge flowing through a certain point per second
1.5V battery: 1 Coulomb 的電荷 做 1.5Joules 的功