Electrical 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 tomeasure charge than counting the septillions of electrons.
Example: Convert 5000mAh to coulombs
- mAh -> C = x3.6
5000mAh = 5000mAh \times 3.6C/mAh = 18000C
flashcards
| Question | Answer |
|---|---|
| What is the SI unit for charge? | Coulombs (C) |
| How is one coulomb defined in terms of amperes and seconds? | One coulomb is equal to one ampere-second (As). |
| What unit is commonly used for measuring battery capacity? | Milliampere-hours (mAh) |
| What is the conversion factor between mAh and C? | |
| How many electrons make up one coulomb of charge? | |
| Convert 5000 mAh to coulombs. | |
| What is the formula to convert mAh to C? | mAh |