Approximately how many electrons correspond to one coulomb of charge?

Approximately how many electrons correspond to one coulomb of charge?

• A. 6.28 x 10^18
• B. 6.28 x 10^12
• C. 6.28 x 10^6
• D. 6.28 x 10^3

Answer: (A)

One coulomb of charge corresponds to a count of how many elementary charges (the charge of a single electron). The elementary charge is about 1.602 x 10^-19 coulombs, so the number of electrons needed for 1 coulomb is 1 C divided by 1.602 x 10^-19 C/electron, which is roughly 6.24 x 10^18 electrons. The option 6.28 x 10^18 is a close rounding of this value, making it the best match. The other magnitudes (10^12, 10^6, 10^3) are far too small and don’t reflect the true size of the elementary charge.

One coulomb of charge corresponds to a count of how many elementary charges (the charge of a single electron). The elementary charge is about 1.602 x 10^-19 coulombs, so the number of electrons needed for 1 coulomb is 1 C divided by 1.602 x 10^-19 C/electron, which is roughly 6.24 x 10^18 electrons. The option 6.28 x 10^18 is a close rounding of this value, making it the best match. The other magnitudes (10^12, 10^6, 10^3) are far too small and don’t reflect the true size of the elementary charge.