Question 1

What is a coulomb?

Accepted Answer

A coulomb (C) is the SI unit of electric charge. 1 C = the charge transported by 1 ampere in 1 second.

Question 2

How do you convert Ah to coulombs?

Accepted Answer

1 Ah = 3,600 C. Multiply ampere-hours by 3,600 to get coulombs.

Question 3

What are the elementary charge and Faraday constant?

Accepted Answer

The elementary charge (e ≈ 1.602 × 10⁻¹⁹ C) is the charge of a single proton. The Faraday constant (F ≈ 96,485 C/mol) equals one mole of elementary charges and is used in electrochemistry.

Question 4

How much charge does a typical smartphone battery hold?

Accepted Answer

A typical smartphone battery rated at 3,000 mAh holds 10,800 coulombs of charge (3,000 × 3.6). That is about 6.74 × 10²² elementary charges.

Microcoulomb to Picocoulomb

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