NCCER Introduction To Electrical Circuits (26103-23) Practice Test

What is the term for an amount of electric charge equal to 6.25 x 10^18 electrons?

Coulomb Ampere Volt Watt

Correct Answer:

Coulomb

Explanation:

Charge is measured in coulombs. One coulomb represents the amount of charge carried by about 6.24 x 10^18 elementary charges. Since each electron has a charge of roughly -1.602 x 10^-19 C, multiplying by 6.25 x 10^18 electrons gives about 1 coulomb of charge in magnitude (the negative sign would make it negative one coulomb). The other units describe different things: ampere is current (how fast charge flows), volt is potential difference, and watt is power. So the term for that amount of charge is coulomb.

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