Units for charge

Units for charge

There are two main ways we can measure charge:

• Coulombs (C): The SI unit. One coulomb is equal to one ampere-second (As).
• Milliampere-hours (mAh): This is commonoly used for batteries - 1mAh=3.6C.

Coulom

• One coulomb is equal to 6.25\times10^{18} electrons! It’s an easier way to

  measure charge than counting the septillions of electrons.

Example: Convert 5000mAh to coulombs

• mAh -> C = x3.6
• 5000mAh = 5000mAh \times 3.6C/mAh = 18000C